A pneumatic drill ( also called a jackhammer or an air drill) is a portable machine driven by compressed air. Pneumatic drills are utilized for drilling into solid substances like rocks. These are also used to break slabs and pavements or to drill small diameter holes in hard rock in mining and construction. There are several advantages to using pneumatic drills, including weighing less than an electric drill. Pneumatic drills can also increase productivity, cost less to operate, cost less to maintain, and provide more of an ergonomic design.