Create a better, more-beautiful deck with the Kreg Deck Jig. This concealed-fastening system works together with Kreg Deck Screws to allow you to install decking without visible fasteners, so all you see is the beauty of your decking instead of a bunch of screws. The Deck Jig features hardened-steel guides to drill precisely positioned pilot holes, and to guide Deck Screws to attach decking from the edge solidly and invisibly whether youre using solid-wood or composite deck boards. The Deck Jig makes drilling the stepped pilot holes and driving screws easy in all situations thanks to three hardened-steel guides one at 90 degree to the board edge, and two at opposing 45 degree angles that allow easy access when working near walls, as well as when creating strong joints where boards butt together end to end. The stepped drill bit creates a perfectly positioned pocket hole and clearance hole for the Kreg Deck Screw, while a stop collar ensures prefect drilling depth. After drilling, just drop a Kreg Deck Screw an integral part of this concealed-fastening system into the same guide, and then drive it with the included square-drive driver bit. Its equipped with a stop collar, too, to ensure that the self-tapping, case-hardened screw gets driven to the perfect depth. The aggressive threads bite securely into the joist while the smooth upper shank and flat-bottom head work together to pull the deck board tightly into place. The Deck Jig Concealed-Fastener System works with composite decking, as well as solid-wood decking such as cedar, hardwoods, and pressure-treated wood kiln-dried after treatment (KDAT) recommended.