Abstract: A jig for guiding the bits of boring and routing tools to predetermined locations on a door in preparation for the installation of a door knob assembly, dead bolt or the like. The apparatus includes an elongated channel-shaped frame member for receiving an edge of a door and having a base portion and two depending side portions, a pair of templates attached to respective side portions of the channel shaped frame member for guiding a boring tool bit to locations along the side of the door, a movable edge boring guide attached over the base portion of the frame for directing a boring tool to predetermined locations along the edge of the door, and a pair of clamps for clamping the frame firmly to the door. The base portion of the frame forms a router support surface to facilitate routing of the edge of the door.