UNOAIR I-44 ( ½ " ) Impact Wrench ( Twin Hammer) Torque : 400 Ft-Lb Specification Model : I-44 Square Drive in : ½ Bold Size Capacity in : u7ˆ mm : 16 Free Speed rpm : 8000 Max Torque ft-lb : 400 n-m : 542 Overall Length in : 7-¹ 7ˆ mm : 181 Net Weight lbs : 5.51 kgs : 2.5 Air Inlet ( in) : ¼ Air Hose ( in) : Avg.Air Consumption cfm : 6 m³ / min : 0.17