Mar 17 2019 Chicago Pneumatic CP7778SP-6 Heavy Duty 1-inch Square Drive Air Impact Wrench. admin No comments 10 Best Air Ratchets 2017Ultimate Torque 1900Nm 1,450ft. The item chicago pneumatic cp7778sp-6 heavy duty 1-inch square drive air impact wrench is in sale since Wednesday, April 29, 2015. Vibration m/s2 10.1 (ISO-28927-2). This item can be shipped to United States.