The Rockwood 1/2\" Twin Hammer Impact Air Wrench features a large-capacity six-vane, ball bearing motor with a twin-hammer impact drive. Twin Hammer design Hard Hitting 450ft-lb torque Time tested design 6 Torque Settings Ring type retainer for positive socket retention Reversible direction It is fully reversible with 6 forward and reverse torque settings and an infinitely progressive throttled trigger control. Contents: (1) 1/2” Impact Gun (1) 1/4” MNPT, Male quick disconnect inlet fitting Specifications: Square Drive: 1/2” RPM: 7,000 free speed Maximum Torque: 450 ft-lbs Air Consumption: 5 cfm @ 90 PSI Weight: 4.4 lbs. Length: 7.5 inches Inlet thread size: 1/4” FNPT Reversible, variable speed, 6 vane, ball bearing air motor, twin-hammer impact drive Side mounted torque limiting control knob. 0 lowest, 5 highest.