SDS-plus bit system tool-free bit changes with automatic bit locking, dust protection and maximum impact energy transfer rateClic Loc Chuck Change System Easily remove the SDS-plus bit holder and snap on the included keyless carbide-tipped 3-jaw chuckMulti-function selector 3 modes of operation, rotation only, rotary hammer and hammer only modeVariable-speed reversing trigger for accurate bit starting, as well as removing fasteners or bound bitsVario-Lock positioning rotates and locks chisel into 36 different positions to optimize working angleD-handle design for extra control, ideal for overhead and downward drilling applications360 Auxiliary handle with built-in depth gauge wide range of movement along with consistent drilling depthDouble insulated, UL listed, complies to OSHA Integral clutch helps minimize torque reaction