[Air Impact Wrench] brings basic instructions apply to replacement tires for cars and trucks and other heavy-duty operation "major tool." ? Its impact mechanism produces 500 ft -.?? Lbs of torque and rotational speed of 7,000 rpm, to quickly complete the operation?. [Pneumatic impact wrench] Features ■ Powerful smooth the impact and maximum torque of 680Nm ■ pressure lubrication system Automatic lubrication impact mechanism ■ Maximum speed 7000RPM [Air Impact Wrench] Specification drive square head size (inch):?? 1/2 torque range (Nm):?? 54-476 ,? maximum torque (Nm):?? 680 No-load speed (rpm):???? 7000 Working pressure: 6.3kgf / cm ^ 2 air intake Size: NPT1 / 4inch Average air consumption (m ^ 3 / ^ min):?? 0.153 intake port size (inch):??? NPT1 / 4 recommendation pipe diameter (mm):?? 10 Working pressure:? 6.3kgf / cm ^ 2? Tool Length (mm):?? 185