Hitachi DH52ME Brushless SDS Max Rotary Hammer, 2-1/16" AHB (Aluminum Housing Body) construction significantly enhances the internal and external durability of the tool Ultra efficient AC Brushless motor extends product life and eliminates maintenance of armatures or carbon brushes Superior performance when using a generator due to an internal inverter circuit that regulates uneven power supply Push button rotation speed selector switch transitions between four power levels of impact and rotation speed to match the application Built-in protection circuit prevents damage to the tool in the event of an abnormality like overload, binding, overheating etc. 16.2 ft-lbs of impact energy for busting through hard material 2,200 Full load max impact rate to quickly remove stubborn material 1500 watts of input power for increased productivity Optimized hammering mechanism for faster drilling speed and higher demolition performance