Makita HM1812 70 Advanced AVT Breaker Hammer, Accepts 1-1/8" Hex Bits, 70 lb Hits Like Air Without the Vibration Efficient 15 AMP motor with improved hammer mechanism delivers 53.9 ft.lbs./72.8 joules of impact energy to handle the most demanding applications Advanced AVT is a synchronized, three-component system that more effectively reduces vibration in varying conditions resulting in a low 6.5m/s2 Advanced AVT provides a mechanical counterbalance system which greatly reduces vibration Advanced AVT provides a vibration absorbing housing