Pneumatic heavy duty impact wrench perfect for small engine repair, bench work, and transmission jobs Maximum torque 75 ft./lbs.; working torque 5 to 50 ft./lbs. Rocking dog double clutch mechanism for smooth operation and extreme durability Energy-efficient motor; comfortable pistol-style grip on ergonomic handle Weighs 2-1/2 pounds; 3/8-inch square drive; free speed 11,000 RPM, Manufacturer: Chicago Pneumatic