Abstract: Supplemental apparatus for a hand-held power drill that uses the rotational movement of the drill for both rotating a drill bit and advancing the drill bit into the work piece. In one form the illustrated apparatus comprises a separate attachment that includes a base for releasibly attaching to a hand drill. The base supports a moveable support unit for releasibly holding a selected drill bit in a position to be advanced into the work piece to drill a desired hole. A transmission mechanism on the base is connected to the support unit and transmits rotation from the chuck of the drill so as to both (1) rotate the drill bit, and (2) move the drill bit forwardly relative to the base into the work piece. The power drill connects to the attachment from the side so that it is disposed generally at right angles to the drill bit.