Pocket Screws for Decks. The company that pioneered the use of hidden fasteners now offers a jig that helps you fasten deck boards. The Kreg Deck Jig is compatible with any solid decking material between 3/4 inch and 1 1/8 inches thick, though you need a minimum deck spacing of 1/4 inch to fasten the boards from both sides. A kit - the jig, spacer rings, a drill bit, and a drive bit - costs $100 online. Kreg Tool Co., 800/447-8638, kregtool.com