The 1/2 Twin Hammer Air Impact Wrench effectively reduces unstable torque peaks, makes the output torque smoother, and effectively reduces vibration, which is more suitable for hard connections. Equipped with advance process, it ensures longer service life for use and there is no special need of maintaining. You can adjust the input air pressure through the pressure regulating valve to control the tightening torque, thus tn ensures high and reliable performance. 1.Twin hammer mechanism has 2 identical hammers that deliver an instantaneous balanced blow,reduce vibration and transfer more torque to drive end of the anvil than any other mechanism on the market. 2.Twin hammer mechanism provides more power end smooth balanced blows. 3.(screened filter) air inlet keeps dirt and debris from damaging the tool. 4.Twin hammer impact wrench is designed for tie shop,suspension,frame and other heavy duty automobile work.