Hardened steel drill guides ensure precise drilling * Locating pin lets you quickly reference last hole drilled * Connect multiple jigs together with the jig extender * Includes Shelf-Pin Jig, locating pin, jig extender, 1/4-Inch drill bit, depth collar, Allen wrench, instruction manual, and four 1/4-Inch shelf pins * Dual position and adjustable 1-Inch and 2-Inch fence with standard hole spacing of 32 mm and a standard hole size of 1/4-Inch also sold separately 5 mm hole size Whether youre boring shelf pin holes in a new entertainment center or adding adjustable shelving in an existing cabinet, the Kreg Shelf Pin Jig will help you get the job done quickly and accurately.