Pneumatically powered device

A pneumatically powered device for rotating, at a relatively high speed, a tool of the type used by a surgeon for performing an operation. A self-contained air motor is removably disposed within an elongated tubular housing easily held and manipulated by the hand of the surgeon and connected by swivel means to conduits through which a gas under pressure is delivered to and carried away from one end of the air motor. Coupling means extend from the other end of the air motor for connection to a tool, such as a drill bit.