Also Known as Air Breaker, Air Jack Hammer, Pneumatic Jack Hammer

A pneumatic drill or jackhammer is a portable percussive drill powered by compressed air. It is used to drill rock, break up pavement, among other applications. It works similar to a hammer and chisel, by jabbing with its bit, not rotating it. Advantages include outstanding operator comfort, low maintenance and quiet operation. Built for hard use and long, trouble-free life.

Source: Sullair
Visit their website for equipment specifications:
http://www.sullair.com/corp/details/0,,CLI1_DIV61_ETI5918,00.html