Milwaukee 5315-21 1-1/2-Inch SDS-max Rotary Hammer Patented Vibration Isolation System (both grips) Single motion bit insertion and positionable chisel lock 1-1/2 in. bit capacity, 6 in. thin wall core bit capacity Dial speed control: 190-385 rpm, 1700-3400 bpm Powerful 11.0 amp motor with Electronic Feedback Control Circuit