WRENCH AIR IMPACT 1/2 in. PRO SERIES. Perfect for removing and tightening lug nuts and bolts Pin-clutch design increases maximum torque while reducing vibration. Ball bearing mounted air motor designed for long life, smooth operation. Light weight aluminum housing reduces operator fatigue, faster heat dissipation Easy access torque regulator with 3 forward torque settings and 1 reverse Conveniently located forward/reverse control.