The STC International 1/2 in. Air Impact Wrench delivers the power you need along with features that minimize user fatigue. Its 650 ft.-lb. of torque and 1,300 ipm handle many challenging jobs. All of the torque is available in reverse, thanks to a twin hammer mechanism. This impact wrench has a muffler system and swivel air inlet. It directs exhaust away from both the workplace and the operator.