It looks alot like a regular hammer, but at the bottom quarter of the handle there is a joint where the airpowered actuator produces a violent back and forth motion that quickly and effectivly drives nails (or whatever) into hard material (wood for example). The air is supplied by a hose that is plugged into the base of the handle.

When the trigger is pulled, the powerfull acuator at the joint begins its wrist-breaking work. In fact, the Air Hammer functions with such brutal force that it not safe for less than four strong people to handle (two on either side). The Air Hammer must never be operated with a person's head near its path of motion. Even an old fashioned manual carpentry hammer can cause sevear injury; imagine what a gorey mess this increadably powerfull tool would make if some know-it-all tried useing it alone or or as a poorly trained member of an Air Hammer team. The trigger

Prevent tragedy: Do not use an Air Hammer unless noone will miss you.