DEWALT DWA31740 Composite Decking Blade, 7-1/4". Features a modified triple chip grind tooth design.Designed for composite decking. Laser-cut plate design for cool, metal-free cuts. 7-1/4" Diameter, 5/8" Arbor. This blade also offers patented body slot technology, along with a laser-cut plate design for cool, metal-free cuts. Specifically designed for composite decking.