Chicago Pneumatic 721 3/8" Air Impact Wrench. This lightweight pistol grip wrench is an excellent choice for bench work and transmission tear-down and assembly. Also suited for work on all types of small engines. Rocking dog clutch with oil lubrication for long life and durability. Energy efficient motor for maximum performance. Built-in power regulator. Teasing throttle for precise control. Forward/reverse button on side. "o" ring supported socket retainer. Rubber scuff guard to protect housing. Pistol-type grip with ergonomically designed handle for less fatigue. Specifications: square drive - 3/8", standard bolt size - 3/8", cfm - 2 1/2, hose size - 3/8", torque range - 5 to 50 ft lbs, ultimate torque @ 90 psi - 75 ft lbs.