Made with an energy efficient and lightweight motor. Twin-hammer motors provide high torque acceleration in the critical first five seconds of use. Features a patented anti-head spread design which increases durability. Handle exhaust. Maximum torque: 1600 ft./lbs. This 1" drive impact wrench is designed with the Twin-Hammer mechanism that provides more power and smooth balanced blows. It's made with a composite pistol style housing, which provides superior comfort from its strong, lightweight, even balanced and compact profile. Also its ergonomic soft grip provides firm comfortable holding for long periods of time. The handle exhaust directs air away from work piece and operator. The SK Pro-Gun family is made with high quality, power, lightweight and comfortable for maximum work and a longer tool life! Maximum torque: 1600 ft./lbs.; free speed: 4,500 RPM; minimum hose size: 3/4"; tool length: 18.42"; average air consumption: 7.9 cfm; weight: 15.36 lbs.