Irwin Tools 14020 Marathon Cordless Circular Saw Blade, 18-Teeth, 6-1/2"Thin 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 tooth cuts uniform equal amount of wood. Blade flatness ensures close tolerances. Carbide tipped Thin 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 tooth cuts