Irwin Tools 14070 Carbide Tipped Marathon® Circular Saw Blade, 10", 40TThin Kerf for fast, cleaner cuts. Heat vents reduce heat that causes build up & pitch. Precision honed C3 carbide tips hold edge longer. Round shape means each tooth cuts uniform equal amount of wood. Blade flatness ensures close tolerances. Carbide tipped Marathon circular saw blade Thin Kerf for fast, cleaner cuts Heat vents reduce heat that causes build up & pitch Precision honed C3 tungsten carbide tips hold edge longer Round shape means each