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Not only are EXTREME-S Ipe Clip BLACK hidden deck fasteners with a 5/32 in. gap give D.I.Y. home-owners and builders a smooth surface, free of blemishes. The EXTREME-S is an edge-mount fastening system used to attach hardwood deck boards. As a result, these fasteners are virtually invisible after installation. This patented design acts as a camouflaging agent between board gaps. This keeps the fastener out of sight. The fastener is injection molded from a polypropylene plastic. This enhances its UV ray and chemical resistant properties. Designed with a black oxide coated stainless steel insert, the fastener securely attaches boards to joists. This aids with longer lasting hold-down strength. When compared to similar unseen fastening methods, EXTREME-S's have been tested in labs to be up to three times stronger. When installing the EXTREME-S, boards are attached to one side. This allows the natural wood to expand and contract. The EXTREME-S is a biscuit fastener, meaning it will fit into the edge grooves of decking boards. Installers can choose to router the 5/32 in. side groove on site, utilize a biscuit joiner for each clip, or purchase pre-grooved boards. Screws are intended to penetrate the EXTREME-S at a 45° angle through the bottom groove edge of the hardwood plank and down into to the joist. By consecutively installing each deck board along with the EXTREME-S fastener, this provides repetitive gap spacing from the EXTREME-S's primary spacer leg.