Bosch 11224VSRC 7/8-inch SDS-plus Bulldog Rotary Hammer with Clic Loc SDS-plus bit system  tool-free bit changes with automatic bit locking, dust protection and maximum impact energy transfer rate Clic Loc Chuck Change System  Easily remove the SDS-plus bit holder and snap on the included keyless carbide-tipped 3-jaw chuck Multi-function selector  3 modes of operation, rotation only, rotary hammer and hammer only mode Variable-speed reversing trigger  for accurate bit starting, as well as removing fasteners or bound bits Vario-Lock positioning  rotates and locks chisel into 36 different positions to optimize working angle