DEWALT 1-1/8 In. SDS rotary hammer kit has 8.5 Amp high performance motor. Shocks - active vibration control, reduces vibration felt at the handles. 3.0 Joules impact energy for fast drilling and chipping speed. Rotating brush ring delivers full power/torque in forward and reverse. Integral clutch reduces sudden, high torque reactions if bit jams. The DeWalt 4-1/2 in. 11,000 RPM 10.0 Amp angle grinder gives superior performance and better overload protection. The paddle switch has a safety lock-off to prevent accidental start ups.