UNOAIR I-40 ( ½ " ) Impact Wrench ( Twin Hammer) Torque : 400 Ft-Lb Specification Model : I-40 Square Drive in : ½ Bold Size Capacity in : u7ˆ mm : 16 Free Speed rpm : 7500 Max Torque ft-lb : 230 n-m : 312 Overall Length in : 7 mm : 178 Net Weight lbs : 4.85 kgs : 2.2 Air Inlet ( in) : ¼ Air Hose ( in) : Avg.Air Consumption cfm : 7 m³ / min : 0.2