Diy adjustable shelf hole drilling jig by: joe truini when drilling holes in cabinets or bookcases for adjustable shelf pins, you need to use a template to make sure the holes are level and a stop on the drill so the holes are drilled to the proper depth.. This is my favorite jig for making holes in the vertical walls of a cabinet so that you can install adjustable shelves. this video shows you how you can build an adjustable shelf pin hole drilling. 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.
