UNOAIR I-41 ( ½ " ) Impact Wrench ( Pin Clutch) Torque : 320 Ft-Lb Specification Model : I-41 Square Drive in : ½ Bold Size Capacity in : u7ˆ mm : 16 Free Speed rpm : 7000 Max Torque ft-lb : 320 n-m : 434 Overall Length in : 7-½ mm : 191 Net Weight lbs : 5.29 kgs : 2.4 Air Inlet ( in) : ¼ Air Hose ( in) : Avg.Air Consumption cfm : 8 m³ / min : 0.23