PowRyte Elite 3/8-Inch Composite Reversible Air Drill with Keyless Chuck (Air Hammer) High blows/minute for fast cutting action, and alloyed steel barrel and heat-treated piston providing more power and longer life Built-in power regulator allows precise control of the speed for multiple applications Coil spring retainer for fast-and-easy chisel changes Touch control trigger for easy user controlling and its ergonomic grip offers greater comfort 1-5/8-inch stroke, 5000 BPM (blows per minute)