Neiko 31392A 1/2" Composite Air Impact Wrench, Twin Hammer, Pistol Grip Twin hammer mechanism reduces the amount of vibration for a smoother operation Pistol like grip allows for a comfortable, ergonomic grip reducing any hand fatigue Light weight aluminum and composite body for extra durability High torque at a max rate of 1,000 ft/lb with 3 forward speeds and 2 reverse speed settings Specs: free speed: 10,000 RPM, air inlet: 1/4" NPT, air consumption: 13 CFM, and 5/8" bolt capacity