Product Description Product Reviews Chicago Pneumatic 717 Zip Gun Air Hammer Most powerful CP Hammer for automotive, truck, off-road equipment use. .498” diameter chisel shank to handle the extra power. Positive action trigger for precise speed control. Applications: Front end work, king pin removal, and installation of bulldozer walking beam bushing, removal of truck anchor springs, heavy-duty spring bushings. Specifications: Shank Opening: .498” Weight: 4.75 lbs. Bore Diameter: 3/4” Piston Stroke: 2-11/16” Avg. Air Consumption: 3 CFM Air Inlet: 1/4” NPTF Min. Hose Size: 3/8” Sound dBA Pressure: 95 dBA Blows per min.: 1800 Weight: 5.20 lbs.