Kreg KMA3220 Deck Jig Kits, Shelf Pin | The shelf pin jig is the ideal tool for the job. Unlike other shelf pin guides, the Kreg shelf pin jig features hardened-steel drill guides that ensure precise and straight drilling, so you will get level, wobble-free shelves. The shelf pin jig also includes a dual-position, adjustable fence for custom hole placement, a locating pin for quick and accurate spacing reference as well as a jig extender that lets you connect multiple shelf pin jigs together for high-speed production work. It also contains an ultra-sharp 5 mm brad-point bit with depth collar that can be stored on the bottom side of the shelf pin jig when not in use.