DEWALT DC212Kl 18-Volt 7/8-Inch Lithium-Ion Cordless SDS Rotary Hammer Kit Shocks- active vibration control significantly reduces vibration and increases user comfort and productivity Compact L-shape design allows access in tight spaces while providing optimal balance 1.7 ft-lbs impact energy provides corded power without the cord Variable speed, reversing switch delivers versatility in all applications Factory-set clutch reduces sudden, high torque reactions if bit jams.