2,100 Blows per minute provide hard hitting cutting action 3-3/4" Piston stroke Vibration damped technology reduces the vibration level to 4.2 m/sec2 Patented AIRCAT design double injection composite grip has been ergonomically designed to provide unmatched comfort for the user Patented AIRCAT silencing technology Includes heavy duty ball-lock quick change chisel retainer adding safety and reliability