Abstract: An apparatus for adapting drill bits and similar tools to a power tool includes a drive shaft which includes a threaded end portion which is connected to a chuck. An intermediate portion of the drive shaft supports a pair of ball bearings which are located in a first cavity, formed in a collar which encircles the drive shaft. The drive shaft has a second end portion which projects into a second cavity formed in the collar. The second cavity includes a threaded portion for connection to a power tool and the second end portion has a hexagonal cross-section.