The air-cushioned Makita 10 AMP Demolition Hammer (model HM1211B) delivers 2,000 BPM and 10.5 ft.lb. of impact energy (14.2 Joules) for demanding concrete applications. The D-shaped handle is engineered to help absorb vibration, while the one-touch latching retainer allows easy bit changes. The hex-style chuck accepts 3/4 in. steel bits.