The DuoFix Side-Fixing Guide allows the boards to be fixed through the side, resulting in a hidden fixing finish. The Guide lays over the decking board and is suitable for board widths of 145-200mm, making it compatible with the Enhanced Grain and Weathered Oak decking boards, and even some softwood decking boards. When used in combination with Durafix® screws and the complimentary driver bit, the Guide aligns the screws perfectly and controls the fixing depth, too. The DuoFix Side-Fixing Guide provides a 6mm spacing between boards.