Torque down or loosen fasteners with an impact wrench — or impact gun — from United Rentals. This electric tool is designed for heavy-duty 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 1" drive impact wrench has an ergonomic pistol grip and a maximum torque of 738 ft.-lbs.