We have tested screwdrivers and name Bosch PSR 18 LI-2 as best in test. The screwdriver gives a lot power for the money, has a high build quality and a user-friendly design. Best premium choice is Dewalt DCD791, which is both strong and compact at the same time.
We carry out all of our tests ourselves and test all products in real conditions. The screwdrivers have been used over a long time in a number of different construction projects, and reviewed in detail by being exposed to a number of strength tests. For example, they have been used to screw substantial screws into both thick oak edging strips and double 45 mm studs. We have looked closely at the following aspects of each screwdriver:
Performance: How powerful is the screwdriver? How does it cope with the different materials? How quickly does it respond? How good is it at removing screws?
Build quality: How straightforward and comprehensive do the buttons and settings feel? How noisy is the screwdriver under different loads? Is it at all wobbly?
Functions: What functions does the screwdriver include? Is there space to store bits on it? Does it have a light?
In our scoring of the screwdrivers, we have also taken into account the choice of material, user-friendliness and ergonomics. Finally, we have examined all of these factors in light of the screwdriver's price to determine its value for money. We thus have higher expectations of an expensive screwdriver than a cheaper one, and vice versa.
User-friendly, strong screwdriver for the home DIYer
Price class: Medium Weight: 1.3 kg Battery: 18 V 1500 Li-Ion Measured noise level: 75.4 dB (average value) RPM: 0-400 rpm and 0-1340 rpm Torque: 46 Nm Gears: 2 LED lighting: Yes Chuck: 10 mm quick chuck
The Bosch PSR 18 LI-2 is the strongest machine in the test and coped with all of the strength tests, regardless of whether they involved hard, thick pieces of wood or long, thick screws to screw in. It was only when we reduced the power and pushed it to its limits that it had a problem with too much resistance. Normally, screwdrivers lock up and sound angry, but the PSR 18 LI-2 simply stops. This feels odd to start with and initially gives a negative impression, but over time you get used to it. Another thing that stands out with the PSR 18 LI-2 is that it's rather slow to start up. From pressing the button until it reaches maximum speed there is a delay that we haven’t experienced previously, but it also means that the screwing process is gentler and that it’s easier to adjust the speed.
The PSR 18 LI2 also stands out from the crowd because of its design. Instead of having the classic appearance with the torque setting as a ring on the front, it instead has a control on the top with a button that you move sideways. The positions are marked with clear graphics that make it easy to understand you increase the screwdriver’s strength the more you move the control to the right. For a professional, it’s more difficult to remember your settings and the design is somewhat limited. But given that DIYers are the target group the PSR 18 LI-2 is aimed at, this is more user-friendly.
Levels of both comfort and ergonomics are high. The screwdriver feels stable and well-balanced in your hands. It’s also quite compact and the build quality feels good except for the fact that the chuck wobbles – only slightly – on our test example. This doesn’t prevent use of the tool. However, it does make us wonder a little about the build quality, but we didn’t encounter any sluggish buttons, loose parts or strange noises. The battery keeps its charge well between uses and a 2.5 Ah battery charges completely in exactly 60 minutes, which is very good. The only disadvantage is that it’s a little fiddly to get the battery out of the machine. Our conclusion is that the PSR 18 LI-2 is a powerful and user-friendly screwdriver with good comfort levels that’s ideal for the average DIY user. It’s also very good value for money.
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Compact screwdriver that still performs with both power and persistence
Price class: Premium Dimensions: 173 x 63 x 203 mm Weight: 1.2 kg Battery: 18 V Li-Ion Measured noise level: 84.4 dB (average value) RPM: 0-550 rpm and 0-2000 rpm Torque: 70 Nm Gears: 2 LED lighting: Yes (3 step) Chuck: 1.5-13 mm quick chuck Accessories included: 2 x 5 Ah batteries, charger, T-STAK kit box
The Dewalt DCD791 is a competent and impressive screwdriver that gives you a lot of power for your money in a compact and handy format which feels well-balanced in your hands. It has no problem screwing through double studs with thick, long screws or penetrating hard wood such as oak. As long as you have the wrist strength and good drill bits, the screwdriver can cope with the work. In dusty environments it has a disadvantage that it stirs up the dust and blows it towards your face, but you have to be standing in a very enclosed environment or very close to the screwdriver for this to be a major problem. The battery included with the machine has a high charge capacity and means that you can work for a long time without having to charge it, but the major benefit is the charger, which is able to recharge the battery while you eat lunch or use the second included battery. The charger is silent, compact and clear in terms of graphics.
The gear button on the top of the DCD791 is sluggish, but all the other functions work smoothly. The integrated holder means that you can easily suspend the screwdriver from your tool belt when you need both hands free and don’t have any surface nearby to put it on. The lamp that illuminates the screw head in dark environments can be set to three different strengths, the strongest of which is extremely powerful. Unfortunately it can’t be completely switched off. On the side of the screwdriver there is a magnet to hold screws and bits, which can’t hold much but is an excellent complement, for example when you have two different screw sizes and quickly need to change between different bits. Overall this is a very powerful but compact screwdriver, with few downsides.
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Screwdriver with double grip for perfect control
Weight: 1.25 kg Battery: 18 V, 2.5 Ah Measured noise level: 81.2 dB Speed: 0-430 and 0-1400 Torque: 32 Nm Gears: 2 LED lighting: Yes Chuck: 13 mm quick chuck Accessories included: Double-ended bit
The Bosch PSR 18 LI-2 Ergonomic is a neat, well designed screwdriver. In terms of name it's confusingly like its sister model, the PSR 18 LI-2, but in other ways they're quite dissimilar. For example, it has traditional number markings for torque on the torque setting, it's weaker and has a differently shaped machine body with an extra front grip. The experience is that it's quite compact and more compressed. The design means that it's easy to hang up or store out of the way. You can also get into narrow spaces easily. At the same time, the LI-2 Ergonomic is solidly built, which makes it relatively heavy and even slightly front heavy. The screwdriver has two grips, one at the front and one a little further back. These are comfortable and rubberised, and the machine feels stable in your hands. The double grip is one of the best things about this screwdriver - it makes it a perfect tool when you're drilling and need good control. Equally, it can be useful to have a two-handed grip when you're screwing in longer screws, because you get good control over the machine.
We didn't notice any strange noises or loose controls. The controls also present just the right amount of resistance. However, the noise profile can feel rather unpleasant due to a whining sound in the background, at least after using it for a while. The LI-2 Ergonomic isn't particularly powerful, but it's perfectly sufficient for the DIY user. It easily copes with screwing everything from plasterboard to decking screws. It reaches its limit with anchor screws in support studs. Here we have to push the motor to maximum to get the screws in, and it only just manages. Instead of stopping suddenly, it just sounds rather angry, but it doesn't generally jerk in your hands. If it does, however, it shuts down automatically and you have to restart it. As a safety function this is excellent because you reduce the risk of wrist injury. The battery lasts for a long time between charges and recharges in a little less than an hour.
If you have two batteries you can change between them and keep the screwdriver running all the time. In terms of functions, the LI-2 Ergonomic has the usual functions such as battery indicator, work lighting, two gears and a rotation direction selector. However, the latter is a slide control instead of a button, which makes it more difficult to reach with a one-handed grip. The screwdriver has no extra functions such as a magnetic plate or other space for bit storage, but it does include a double-ended bit. We would have preferred a magnetic bit holder to be included. The compact design makes the Bosch PSR 18 LI-2 Ergonomic an excellent alternative for a DIY user, regardless of whether you're assembling a kitchen or building a patio.
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Neat, good value for money screwdriver with slightly sluggish buttons
Price class: Budget Battery: 18 V Li-Ion Measured noise level: 76.1 dB (average value) RPM: 0-350 rpm and 0-1250 rpm Torque: 44 Nm Gears: 2 LED lighting: Yes Chuck: 10 mm quick chuck Accessories included: 2 x 18V 1.5 Ah battery
The Einhell TE-CD 18/2 Li Kit is a battery driven drill/driver that suits a wide range of tasks despite the fact that it belongs to the upper end of the budget class. The battery time is among the best in our test, and it can cope with screwing hefty screws into soft fir wood without complaining. It’s only when we push it in terms of power on a thick oak edging strip that we can see it’s not an elite machine. However it doesn’t completely fail at any of the test tasks. One thing we did note which can be slightly irritating is that it’s quite slow in reverse. This means that it takes longer than you’d want to unscrew a screw. The quick chuck makes it easy to change between drill and bit holders. The battery also holds its charge well between uses and charging takes a mere 40 minutes for the 1.5 Ah battery included in our test kit, which is extremely good.
The TE-CD 18/2 is relatively light and compact, which makes it easy to gain access even in restricted spaces. The rubberised grip makes it feel stable in your hands, and the balance of the screwdriver is good, contributing to the positive impression. However, the button to change between first and second gear is extremely sluggish, and it’s also tough to get the last step of torque. The intelligent belt clip on the side saves time because you can easily hang the screwdriver from your belt while you carry out other tasks. This came in handy several times when we were standing on a ladder and had to put the screwdriver down to measure something. Another practical function is the LED lighting, which makes it easy to see the screw head even in dark conditions. However, you can’t turn off the light. Something the screwdriver lacks, but which would have been useful, is integrated space for screwdriver and drill bits on the body of the machine. But overall, this is a really good and versatile screwdriver for its price class.
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Compact, good grip and app functionality
Price class: Premium Dimensions: 173xBx248 mm Weight: 1.8 kg Battery: 18 V, 5 Ah Measured noise level: 85 dB Speed: 0-600 rpm or 0-1900 rpm Torque: 31 Nm Gears: 2 LED lighting: Yes Chuck: 13 mm quick chuck Accessories included: Double-ended bit
The Bosch GSR 18V-60 C Professional is a stable and tall screwdriver with a compact front that means you can easily get into even narrow spaces. For a tool belonging to the Bosch blue range - which is aimed at professionals - it isn't particularly powerful. But it's perfectly acceptable for a DIYer. For example, the screwdriver is fine for screwing anchor screws into a supporting stud, but you need to use maximum strength to stop it protesting. And you can simply forget about putting thick screws in solid hardwood. But the GSR 18V-60 C has other advantages. For example, you can link it with an app to remember the settings you've used. This can be useful if you're doing fine carpentry. But for the majority of private users this type of memory setting isn't really necessary. The app does give you fast access to the manual, however, and you can also control the sensitivity of different functions. Unfortunately our test examples didn't include any chips so we couldn't test how well this works in practice.
The primary strength of the Bosch GSR 18V-60 C Professional is in its format, combined with the stable design. The screwdriver has good work lighting, a clear battery indicator and a fast charger that means you're working again from a flat battery in about 40 minutes. The belt clip included with the screwdriver is also very useful. But if you're looking for sheer raw strength, this isn't the screwdriver for you. Particularly not at this price level. But for a perfectionist who wants a screwdriver in a compact format that will cope with domestic DIY - everything from building a patio to installing a kitchen - the GSR 18V-60 C is a reasonable choice. It's comprehensive, compact, well balanced and remembers your settings.
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Slightly underpowered but versatile budget screwdriver
Price class: Budget Weight: 1.21 kg Battery: 18 V Li-Ion Measured noise level: 80.6 dB (average value) RPM: 0-440 rpm and 0-1600 rpm Torque: 45 Nm Gears: 2 LED lighting: Yes Chuck: 13 mm quick chuck
The Ryobi RCD1802M is a screwdriver with many aces up its sleeve, such as a magnetic plate on the foot where you can place screws, together with a bit holder. There is also a built-in spirit level on the top of the screwdriver. These functions are very welcome, particularly for this price class. In terms of design, it’s otherwise a rather large and bulky screwdriver. It has a thick neck and quite a tall battery, which makes it feel substantial. At the same time, it’s a little unbalanced in your hands and this makes it feel heavier than it actually is. On the whole it gives a good impression, which is increased still further by the extra functions we named previously.
This screwdriver has two Achilles heels: its strength and charging time. In terms of power it coped with more than what we expected, given the price. At the same time when we pushed it, it didn’t really reach the level that a DIYer might require. For example, it has to work at relatively high strength to get a substantial screw into a thick stud. On the other hand, the RCD1802M delivers as long as we set it on maximum level and this means that it’s still fine for the intermittent DIYer who doesn’t want to spend more than necessary on tools. However, the charging time for the 2.5 mAh battery being more than 1.5 hours is a tad long and we hope this will improve in the future. But just the fact that such a large battery is included for this price makes us happy.
Good basic machine for simpler tasks
Price class: Budget Weight: 1.6 kg Battery: 18 V 2 Ah Li-Ion Speed: 0-400 rpm and 0-1500 rpm Torque: 45 Nm Gears: 2 LED lighting: Yes Chuck: 13 mm quick chuck
The Cocraft LXC DD18 is a relatively heavy but substantial screwdriver. The buttons, handle and other details are positioned as you'd expect. One weakness is that the head can’t be fully locked, which is a disadvantage when you want to tighten the chuck. If you tighten it without depressing the main switch at the same time, it’s difficult to get it to lock sufficiently well for the bit holder to stay in place during use. This means that we lose the bit holder a couple of times while we’re working. The grip on the LXC DD18 is rubberised and the screwdriver sits nicely in the hand. All the buttons are easy to adjust and have a good amount of resistance. The screwdriver reacts quickly when you depress the main switch, and stops quickly too when you release the switch. The noise profile is a bit unpleasant. Unfortunately our example is also a bit unbalanced in the chuck, and the bit holder moves unevenly. This becomes clear when we study the movement pattern in detail, and it reduces the score for build quality. But the long warranty period is a positive point.
In terms of strength, the Cocraft LXC DD18 performs on the same level as many other screwdrivers aimed at the DIYer. It can easily cope with simpler tasks, such as screwing plasterboard screws, installing cabinet frames and screwing into decking boards. When it comes to heavier tasks, however, we begin to see its limitations. For example, the battery life is reduced considerably under heavy loads. The LXC DD18 is also just able to screw anchor screws into a patio frame, but that’s really the top of its range. This level of strength is probably sufficient for many DIYers. But if you're after a screwdriver that performs well in demanding conditions, such as extending a house or screwing often into solid wood, you need to buy something more powerful. However, given its price the Cocraft LXC DD18 is relatively powerful and makes a good option for those with less demanding needs.
A lot of power for your money, but the balance isn’t great
Price class: Budget Battery: 18 V Li-Ion Measured noise level: 80.1 dB (average value) RPM: 0-410 rpm and 0-1650 rpm Torque: 52 Nm Gears: 2 LED lighting: Yes Chuck: 13 mm quick chuck Accessories included: 2 x 1.5 Ah batteries, charger, kit box
The Black & Decker BL186KB is a really strong screwdriver that coped with all of the tough tasks we gave it, despite only being in the upper end of the budget class. It was only when we pushed it to its utmost at lower strengths that we could see where it starts to struggle – and even then it did pretty well. Screwing into thick oak edging strips or substantial studs is no problem for this machine. The battery is economical and the BL186KB works for a long time on one charge. However, a major disadvantage is that the battery doesn't have an indicator. Charging also takes a long time with the small, extremely simple charger. A 1.5 Ah battery takes over 1.5 hours to fully charge.
The biggest weakness of the BL186KB is its design. It’s unbalanced at the front, which you really notice when you use it for longer periods. It’s also rather bulky and a bit clumsy. But there are some nice features. For example it has a bit holder and LED lighting on the foot. Unfortunately you can’t turn the lighting on and off as you want, but it's still a welcome addition. The torque setting works well and it's easy to remove the battery. The BL186KB’s noise level is average, but the noise profile is extremely unpleasant, with a strident sound. But if you can live with that and the fact that it's rather clumsy, it's a powerful screwdriver for the money.
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Responsive but expensive without great performance
Price class: Premium Weight: 1.8 kg Battery: 18 V Li-Ion Measured noise level: 84.7 dB (average value) RPM: 0-550 rpm and 0-2100 rpm Torque: 60 Nm Gears: 2 LED lighting: Yes Chuck: 13 mm quick chuck Accessories included: Supplied with 2 x 2.0 Ah Pro Lithium Ion batteries, 40 min charger, side handle and case.
The AEG BS 18CBL LI-202C drill/driver responds immediately when you press the button, and makes it easy to regulate the speed while screwing. But otherwise it’s a bit of a compromise. It’s strong and has the functions you’d want, but doesn’t provide top performance in any category – despite being quite expensive. It passed the strength trial with no problems and can cope with screwing both chunkier screws into more robust studs and harder wood types, although some of its competitors perform better for a lower price. The torque control is very straightforward, the buttons are easy to set in the right positions and the build quality generally feels OK till we start to screw. Because what we don’t like about this screwdriver is the noise profile. The measured noise level isn’t particularly high but the noise is an unpleasant one that cuts into your ears when using the screwdriver – and particularly just when you stop using it. We had to use hearing protectors to make the working environment more comfortable.
Another disadvantage of the 18 CBL is that it feels unbalanced and heavy in your hands. Given the price, these are disadvantages we hadn’t counted on. The battery lasts well between charges and can be charged to a high level relatively quickly. Despite the fact that it’s a 2.0 Ah battery, it can be completely charged in just over 60 minutes. Overall, the AEG BS 18 CBL LI-202C is a useful but rather noisy piece of kit – but one that we had higher expectations of given its price class.
Find deal atmytoolstore.de
Screwdrivers are the most frequently used electrical tool in most people’s toolboxes. So if you know that you’re going to be doing a lot of DIY, it can be sensible to invest in a good value for money but slightly more powerful version. Meanwhile, those of you who will only use one sporadically for lighter work should perhaps instead invest in an affordable model in the budget segment.
Screwdrivers are available with different voltages and different primary functions. In our guide below you can read in more detail about what distinguishes them, but a standard screwdriver should be an 18 V drill/driver – simply because it will suit a wide range of tasks.
When you're going to buy a new screwdriver, you can also think about the other battery-powered tools you already have. The majority of manufacturers today have systems that mean the same battery fits a large number of their tools. So, for example, if you have an electric jigsaw of particular brand, it may be sensible to buy a screwdriver of the same brand but without a battery. However, it’s always a good idea to have two batteries so that you can charge one while you’re using the other.
When you have chosen a model, it can be useful to check the kits it’s sold as part of. If you already have batteries to one electric tool from the same manufacturer, you can buy the screwdriver without a battery. But if you don’t, you can often find affordable kits with double batteries and a tool case.
What do you need to think about when you’re buying a screwdriver? If you have a good understanding of how they work, what distinguishes the models and what functions and accessories are available, it’s easier to make a well-informed and efficient choice.
Screwdriver types There are a variety of different types of screwdriver. For example, some are only intended for screwing with, while others are also intended for drilling.
Different types of screwdriver are described below:
A small screwdriver. Often quite weak, but handy for the odd simple task. For example, if you want to hang up a few pictures or renovate a couple of items of furniture.
A machine intended for screwing in or removing screws.
The advantage of a simple screwdriver is that they are often good at tightening screws in tough timber, unlike many combination machines.
A screwdriver with a drill bit that strikes in the direction of rotation. It strikes the screw by having high torque. The function is similar to that in an impact wrench.
The advantage of an impact screwdriver is that it can cope with tougher resistance. When a screwdriver can't cope with a screw, that’s when you need an impact screwdriver. The process will also be quicker and more ergonomic as you don’t have to push against it when screwing. But they aren’t intended for drilling in concrete, even though the name may make you think that. They have a drill bit but are only intended for screwing with.
A screwdriver that you can also drill with. This combination machine is equipped with a chuck so that you can choose between a drill or bit holder, and often also have a number of gears and torque settings.
There are also drill/drivers with an impact function. The idea with many of these is for them to also be able to cope with drilling in concrete. But not all of them are good in terms of performance on this last point. Make sure you do thorough research before buying.
Right angle impact driver
The shape makes it suitable for narrow spaces where normal screwdrivers won’t fit.
A special screwdriver equipped with a depth stop. This is intended for sheet material. When you use it, it drives in the screw extremely quickly but stops at exactly the right depth.
The strength of the screwdriver is what primarily determines its torque. Torque is stated in Newton metres (Nm), and the size of the torque determines how hard the screw is screwed in. The screwdriver’s maximum torque is determined by the motor power and efficiency. And the power is in turn dependent on the voltage it is supplied with. To simplify slightly, the higher the voltage, the more powerful machine and the more it can cope with tough timber, substantial screws etc. The maximum torque can also be called the torque limit. As a rule, the torque limit can be adjusted and reduced several steps from maximum. This can be selected on the basis of how hard you want to screw in the screw.
For easier screwing work, such as assembling flat pack furniture (IKEA and similar), a torque of 3-5 Nm is often sufficient. For more difficult tasks, such as hex bolts, a torque of 40 Nm or more is recommended. In the case of extremely high torque there are models that jerk so much they can injure the user’s wrists if not used carefully. A screwdriver with extremely high torque must therefore be well designed to avoid negative consequences. Today, 18 V is the most common voltage for battery-operated screwdrivers. One major advantage with this voltage is that you can often use batteries from the same brand on different types of machine. This where you can buy “bare” machines and save money by sharing the batteries between them.
However, 18 V is quite powerful, and for some consumers unnecessarily so. Weaker screwdrivers tend to be cheaper and weigh less.
For this reason there are also screwdrivers with lower voltages – everything from a couple of volts less to mini-screwdrivers of just 3-4 V. Screwdrivers with a voltage of around 10-12 V are generally more compact and weigh less than 18 V models.
he most common types available are battery-operated screwdrivers, because batteries have improved so much today in terms of the power you need for screwing. But there are also mains powered screwdrivers. The advantage of these is that you don’t have to change the battery. The disadvantage is that you are limited to the cable length and any extension cable.
The most common type of screwdriver comes with a battery. Here there are three crucial points. Battery quality, battery life and how quickly you can recharge the screwdriver after use. Battery capacity is stated in ampere hours (Ah) and together with the power (W) this determines the battery life. For example, a battery with a capacity of 4 Ah should be able to deliver a 4 ampere current for 1 hour, or alternatively 1 ampere for 4 hours. As a concrete example, a battery of 4 Ah should be able to screw in around 1800 screws.
The advantage of batteries with a higher capacity (more ampere hours) is that they can screw more screws before they have to be recharged. The disadvantage is that they are heavier and larger, which can be tiring on the arm muscles over time. Important aspects when buying a screwdriver are the tasks you will be using it for, the number of batteries included and access to the nearest power outlet. For the DIYer there are usually plenty of nearby outlets. Then it can be worth investing in a screwdriver with two batteries of around 1.5-2 Ah and changing between them.
There’s not much difference in terms of weight between a screwdriver with a 3 Ah battery and one with a 1.5 Ah battery, but it’s still a couple of hundred grams. Over time that can be quite a difference if you’re going to do a lot of screwing. Particularly if you're using the screwdriver overhead when installing a ceiling, for example. But if you want to recharge less often, a bigger battery is preferable. The actual charging time varies too. Partly as a result of battery capacity, and partly how good the charger is. A charging time of 2.5 hours isn’t unusual for the budget and medium price segments, while an hour or less is common for the professional segment.
Other than the ampere hours (Ah), the battery voltage (V) also plays a role. The higher the voltage the battery can supply to the motor, the greater the power it will have. But the higher the voltage the battery supplies, the more quickly it uses up its energy. It’s the screwdriver voltage that determines the voltage of the battery that goes with it. Today the most common voltage for battery-operated screwdrivers is 18 V. These batteries can often be used for several types of machines from the same manufacturer, such as tiger saws or strimmers. As more manufacturers now sell battery-operated machines without batteries for a lower price, you can save money by having a number of machines that share the same battery. In some cases you can even use a battery with a significantly higher voltage (e.g. 48 V) with a lower voltage appliance. This means that you can share batteries between your screwdriver and more powerful machines such as strimmers and motor saws.
The screwdriver can also be equipped with gears. Lower gears give more power, and higher gears give more speed. The gear you should use is determined by the task. Easier screwing can be carried out in higher gear and vice versa.
There are screwdrivers without chucks, which just have a bit holder. But there are also screwdrivers with chucks, and these are the most common type today because many people use screwdrivers to drill with. The size of the chuck is important as it determines how large a drill bit you can use, and thus how big a hole you can drill.
Many screwdrivers have built-in LED lighting. This is a very useful function which makes it easier to see the screw head even in dark environments
The average screwdriver isn’t a cheap product. Good guarantees and good access to spare parts, such as new batteries, are therefore important aspects when it comes to choosing make and model.
Bit holder: Bit holders are available in a range of variants. One of the more useful is the magnetic type that holds the bits in place using magnetism.
Bits: High quality bits are essential for straightforward, no fuss work. They also last longer and damage fewer screw heads.
Extra batteries: When buying a battery-operated screwdriver, it's usually sensible to buy an extra battery. Then you can carry on working while the discharged battery is recharging.
Chuck: Sometimes chucks wear out. If tightening the screw holding it in place doesn’t suffice, on the majority of models you can undo it and replace it with a new chuck. Remember that chucks are threaded anti-clockwise.
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