DEWALT D25600K 1-3/4-Inch SDS Max Rotary Hammer Kit 11.5 Amp motor delivers high output and overload protection Electronic variable speed allows the user to control the speed of drilling and chipping 8 ft-lbs of impact energy provides fast drilling and powerful chipping SDS max tool holder is compatible with most bits Rear handle mount means less bending over when using tool in down drilling applications Factory-set clutch reduces sudden, high torque reactions if bit jams