UNOAIR I-603 ( " ) Impact Wrench ( Twin Hammer) Torque : 553 Ft-Lb Specification Model : I-603 Square Drive in : Bold Size Capacity in : 1-27 64 mm : 36 Free Speed rpm : 5700 Max Torque ft-lb : 553 n-m : 750 Overall Length in : 8-21 32 mm : 220 Net Weight lbs : 6.17 kgs : 2.8 Air Inlet ( in) : Air Hose ( in) : Avg.Air Consumption cfm : 8 m / min : 0.23