12a, 1-9/16″, corded, variable speed, sds max, combination, concrete/masonry, rotary hammer drill, tool free bit changes with automatic bit locking, dust protection & maximum impact energy transfer rate, combination dual mode selector knob allows the tool to be switched between rotary hammer mode or hammer only mode, 20 plus 1 clutch settings perfect torque adjustments for precise screw driving, innovative service modules designed so a qualified service technician can quickly replace the brushes & cord, 360 auxiliary handle provides a wide range of movement along with operator comfort, integral clutch helps minimize torque reaction, chisels, drills & chips through block, tile & tough materials.