Factory-Reconditioned Bosch 11224VSRC-RT 7/8-Inch SDS-plus Bulldog Rotary Hammer with Clic Loc Reconditioned Bosch Products have a One-year warranty through the Bosch factory or an authorized service center 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