Quickly tighten and loosen large nuts, bolts and other fasteners. 1/2 in square drive, 220 ft-lb maximum torque. Die-cast aluminum gear housing for durability. Rocker style switch for one-handed operation. Rated power 120 V, 60 Hz, 7.5 A, no load speed 0 to 2100 rpm. Impacts per minute 0 to 2700 ipm. Includes 4 sockets 11/16 in, 3/4 in, 13/16 in, 7/8 in and heavy-duty storage case.