Torque down or loosen fasteners with an impact wrench - or impact gun - from United Rentals. This electric tool is designed for industrial applications. Save yourself the strain of doing it by hand; impact wrenches are heavy-duty tools that do the work for you. It has torque control for variable speed and torque. This 3/4" drive impact wrench has an ergonomic pistol grip and a maximum torque of 450 ft.-lbs.