SDS-Max bit system offers tool-free bit changes, with automatic bit locking, dust protection, and efficient impact-energy transfer rate Combination dual mode selector delivers 2 modes of operation: rotary hammer and hammer-only mode Vario-Lock positioning rotates and locks chisel in 12 different positions to optimize working angle 360-degree auxiliary handle provides a wide range of movement Integral clutch helps minimize torque reaction, Weight: 13.2 lbs., Manufacturer: Bosch