Ideal for 1 in. plus materials with 6 in. board width on 16 in. joist spacing. Economical, efficient, and attractive fasteners are essentially invisible. All fastening work done from top side. Relieves stress caused by natural shrinkage of deck boards. Only one biscuit and one screw required at each board/joist intersection. Affords easy deck resurfacing by eliminating nail pops. Corrosion-resistant trim head. Swaneze stainless steel finish screws included. Formed from UV-resistant polypropylene. Use on hardwoods, mahogany and teak. Board spacing: 3/32 in.