UNOAIR I-31 ( " ) Impact Wrench ( Pin Clutch) Torque : 220 Ft-Lb Specification Model : I-31 Square Drive in : Bold Size Capacity in : ½ mm : 13 Free Speed rpm : 9500 Max Torque ft-lb : 220 n-m : 298 Overall Length in : 5-w/ ˆ mm : 149 Net Weight lbs : 2.87 kgs : 1.3 Air Inlet ( in) : ¼ Air Hose ( in) : Avg.Air Consumption cfm : 4 m³ / min : 0.11