ACA5300-A-T. 2-11/16" Piston stroke. 1,760 Blows per minute for fast cutting action. Multi-patented muffler/exhaust system gives this tool and extremely low noise and vibration level. Designed for ultra heavy duty, driving out shackle pins/king pins, and cutting large bolts and fasteners. Heavy Duty ball lock quick change chisel retainer adds safety and reliability. 2 year warranty on material and workmanship.