If you are adding shelf pin holes to an existing piece of furniture or building shelves from scratch, the Kreg Shelf Pin Jig is the perfect tool for the job. Unlike other shelf pin guides, the Kreg Shelf Pin Jig features hardened steel drill guides which ensure precise and straight drilling, so you get solid 4-corner secure shelving. The Shelf Pin Jig also includes a dual position adjustable fence for custom hole placement, a locating pin for quick and accurate spacing reference, a handy jig extender which lets you connect multiple Shelf Pin Jigs together for high-speed production work, and an ultra sharp 1/4e brad-point bit with depth collar which can be stored on the bottom side of the Shelf Pin Jig when not in use.