The 1-9/16 in SDS-Max Rotary Hammer offers a heavy-duty 5.5 ft-lb of impact energy for solid performance, even when drilling in hard aggregate. Constant Power Technology ensures consistent drilling power for the toughest applications handled by electrical, mechanical, plumbing, HVAC and general construction contractors. A 12-position chipping adjustment lets you maintain the optimum hammer position while chipping in any orientation. A mechanical clutch protects the motor when the bit binds and two-mode operation offers maximum versatility regardless of the application.