The DEWALT D25063K 1-3/4" SDS Max Combination Hammer features SHOCKS - Active Vibration Control which reduces vibration felt by the user at the handles; a DEWALT Perform and Protect feature. A 2-Stage & E-Clutch provides maximum control in bind up situations; also a DEWALT Perform and Protect feature. The 8.0 Joules of impact energy provides fast drilling and powerful chipping, and a 13.5 Amp high-performance motor provides high performance & overload protection. It has an electronic variable speed dial which allows the user to control the the speed of drilling or chipping while maintaining speed under load. It also offers a rear handle mount that means less bending over when using tool in down drilling applications. A trigger lock-on reduces user fatigue while chipping, and an electronic soft start provides the user more control when the trigger is pulled. This hammer also features a chisel rotation mode which allows the user to turn the chisel without having to remove it. This unit offers a 2-Stage and E-clutch, along with a no load speed of 210-415 rpm, and blows per minute at 1,430 - 2,840 bpm.SHOCKS - Active Vibration Control Reduces vibration felt by the user at the handles