2016 Air Impact Wrench 1 2 Torque Testing Ingersoll Rand Chicago Pneumatic Jet ToolsFull teasing ergonomically developed trigger. Chicago pneumatic #7748 1/2 high-torque impact wrench heavy-duty 1/2 composite impact wrench. Universal & durable twin hammer mechanism. Maximum Torque = 922 ft. Durable steel aluminum alloy back housing. Free Speed = 8200 rpms.