A guide for a fastener hand tool is disclosed including a truck having slidable engagement with a track affixed to the fastener hand tool. The slidable engagement comprises mated interlocking geometries between the truck and the track. A clamping mechanism is disposed on the truck for temporarily clamping opposing sides of the truck to the track at a desired position along the track and a contact piece having a non-marring, wear resistant surface is affixed to the truck. The contact piece is disposed for referencing against a guiding edge for a workpiece relative to the fastener delivery point. The truck can comprise a symmetrical shape such that the truck can be alternately engaged to the track with the clamping mechanism on a left side of the fastener hand tool or with the clamping mechanism on a right side of the fastener hand tool.