High durability in mechanical parts, motor and carbon brush. TOOL ONLY!USER BENEFITS:2 operation modes ? hammering with rotation and rotation only.Speed and torque in reverse are the same as forward rotation by using brush holder unit.One-touch sliding chuck for easy bit change.Easy-to-operate large trigger switch and lock-on button.Double Insulation, Variable Speed, Reversing, SDS Plus, Torque Limiter and Carry Case. Tool sold without bit.