* The Pocket-Hole Jig 320 works with materials from 13mm to 38mm thick * It features dual drill guides, a removable spacer and thickness stops for 13mm, 19mm and 38mm material giving you the versatility you need for building with boards and plywood. * The included material thickness gauge and easy-to-set drill bit make installation simple, while the convenient clamp adapter and the non-slip base keep the jig securely in place as you drill perfectly positioned pocket holes, every time