Product details:

Most controllable CP Hammer available. Ideal for complete body shop work. Positive action trigger for precise control over speed range. Versatile—handles widest range of applications. Front end, exhaust, frame, body work, etc. Specifications: Shank opening: 0.401". Weight: 3-1/3 lbs. Bore Diameter: 9/16". Piston stroke: 3-1/8", Avg. air consumption: 2 CFM. Air inlet: 1/4" NPTF. Min. Hose size: 3/8".