UNOAIR I-447 ( " ) Composite Impact Wrench ( Twin Hammer) Torque : 600 Ft-Lb Specification Model : I-447 Square Drive in : Bold Size Capacity in : ] mm : 13 Free Speed rpm : 7500 Max Torque ft-lb : 600 n-m : 814 Overall Length in : 6-11 16 mm : 170 Net Weight lbs : 4.41 kgs : 2 Air Inlet ( in) : Air Hose ( in) : Avg.Air Consumption cfm : 8 m / min : 0.23