Air Impact Wrench] [basic instructions classic 231C instrument is the most popular tool of its kind. Launched 25 years ago, after continuous improvement, the series tool provides pure power and performance characteristics to easily cope with the most difficult task -?? And After market testing the durability and economy. [Pneumatic impact wrench] Features * special impact structure pressurized lubrication ? Easy maintenance structure 2 Adjustable power regulator] [Air Impact Wrench Specification drive square head size (inch):??? 1/2 Torque Range (Nm):?? 34-407 Maximum torque (Nm):?? 813 No-load speed (rpm):??? 8000 Working pressure: 6.3kgf / cm ^ 2 air intake Size: NPT1 / 4inch average consumption volume (m ^ 3 / ^ min):?? 0.119 intake port size (inch):??? NPT1 / 4 recommendation pipe diameter (mm):??? 10 Working Pressure (kgf / cm ^ 2 / ^)? : 2.63kg ?? tool length (mm):?? 185 Weight (kg):??? 2.63