UNOAIR I-410 ( " ) Composite Impact Wrench ( Twin Hammer) Torque : 369 Ft-Lb Specification Model : I-410 Square Drive in : Bold Size Capacity in : 1-7 64 mm : 28 Free Speed rpm : 7200 Max Torque ft-lb : 369 n-m : 500 Overall Length in : 7-31 64 mm : 190 Net Weight lbs : 3.75 kgs : 1.7 Air Inlet ( in) : Air Hose ( in) : Avg.Air Consumption cfm : 6 m / min : 0.17