High durability in mechanical parts, motor and carbon brush.?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 enables easy bit change.Ergonomically designed rubberized grip provides more control and comfort.Easy-to-operate large trigger switch and lock-on button.Double Insulation, Variable Speed, Reversing, SDS Plus, Torque Limiter and Carry Case.