SDS rotary hammers feature SHOCKS-Active Vibration Control and are designed to provide maximum performance, jobsite durability, and increased comfort. The 1-in. hammers feature an 8-amp motor that delivers 0 to 1150 rpm and 1 to 4300 bpm, and a large hammering mechanism that generates 2½ ft.-lbs. of impact energy. DeWalt. 800-433-9258.