The drill chucks that work with this drill driver are of the keyless kind. The drill driver runs on a rechargeable battery, so it's cordless.
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From OnBuy
Bosch Professional 18V System GSR 18V-21 Cordless Drill Driver (max. Torque: 55 Nm, excluding Rechargeable Batteries and Charger, in Cardboard Bo
Conrad Electronic
Bosch Professional GSR 18V-21 06019H1009 Cordless drill 18 V Li-ion w/o battery