The AIRCAT 5300-A-T is a .498 Shank opening Air Hammer designed for the toughest applications. It has a heavy duty Quick Change Chisel Retainer that prevents air bypass that is common with spring type retainers. The patented AIRCAT ergonomic grip makes the 5300-A-T the most comfortable Air Hammer in this class. It has the standard AIRCAT 2 Year Warranty. Other specs as follows: 1560 Blows Per Minute, 2 11/16" Piston Stroke, weighs 4.6 lbs, 9" long, uses 8 CFM on average.