This hammer drill is a perfect companion when you take on your building project. Since it runs on a cord, you get more constant power than with a battery.
From Amazon
Makita HP2050/2 240V 13mm, 2 Speed Percussion Drill Supplied in a Carry Case, 1/2_Inch
Powertool World
Makita HP2050 2-Speed 13mm Percussion Drill 240v