Chicago Pneumatic 797 1" Heavy Duty Air Impact Wrench. This 1" drive wrench provides plenty of power and durability for the truck tire shop. Durable rocking dog clutch ideal for tire work. Energy efficient motor. Teasing throttle for easy bolt starting. Convenient reverse valve. Extra power for tire work on trucks, buses and heavy equipment. Ultimate torque of 1400 ft lbs. Ring socket retainer makes it easy to change sockets. Dead handle for easy control. Specifications: square drive - 1", standard bolt size - 1 1/4", cfm - 12, hose size - 1/2", torque range - 150 to 900 ft lbs, ultimate torque @ 90 psi - 1400 ft lbs.