This product features 6 hardened-steel drill guides that ensure perfectly vertical holes for stable shelf placement. The removable, dual-position fence allows drilling from 2 different distances from the edge of the workpiece. With a standard 32 mm hole spacing, you can have proper support and balance for your shelves. It also includes a 5 mm brad-point drill bit and a locating pin for precise registration. You can easily store the locating pin, drill bit, and depth collar in the built-in storage. A comprehensive owner's manual is also included. The hardened-steel Kreg drill guides come with a lifetime guarantee.