Air Impact Wrench] [basic instructions sliding key touch switch forward torque adjustment proprietary quiet technology, low noise] [Air Impact Wrench Features ■ Maximum torque of 407Nm ■ Forward reverse torque power regulator ■ Patented one-handed positive / reverse control [Air Impact Wrench] Specification drive square head size (inch):?? 3/8 Torque Range (Nm):??? 34-312 Maximum torque (Nm):?? 407 no-load speed (? ? rpm) ?: 15000 against institutions:?? Shuangchui average gas consumption (m ^ 3 / ^ min):??? 0.113 intake port size (inch):??? NPT1 / 4 recommendation pipe diameter (mm) ?:? 10 Working Pressure (kgf / cm ^ 2 / ^):?? 6.3 tool length (mm) 155 Weight (kg) 1.13