Chicago Pneumatic Industrial Duty Air Impact Wrench, 1/2" Square Drive Size 110 to 553 ft.-lb.

These pistol-grip air-powered impact wrenches have a square drive and a standard anvil length. They are full-size impact wrenches with high torque output. The pistol grip has a trigger that is pressed to activate the wrench. Pistol grips provide ergonomic handling when working on vertical surfaces from the user's waist to chest, horizontal surfaces at mid-thigh or lower, and horizontal surfaces directly overhead.