Bosch 11316EVS Sds-Max Demolition Hammer, 14 AmpVariable speed dial, SDS max bit system tool free bit changes with automatic bit locking, constant response circuitry provides soft start, maintains constant speed under load, provides overload protection, service minder light indicates when preventative maintenance is required, lock positioning rotates and locks chisel into 12 different positions, padded rear handle, 360 degree auxiliary handle, double insulated, UL listed, complies to OSHA.