Astro's Pneumatic Stubby Ratchet Wrench is the ideal 1/4" ratchet for confined working areas, such as under dashboard work and small engine repair. Accommodates 1/4" / 6mm bolts. It's compact and lightweight with a special reinforced planetary gear made of “Micro Grain” powder by gas forging. An internal ring gear with three planetary gears provides maximum service life. Features a self lubricated blade to prevent cylinder and end plates from wear. Includes a built-in regulator to maintain air pressure at 90-120 psi at an average air consumption of 3 CFM.