Mibro 431840 Carbide Tipped Circular Saw Blade Set Thin Kerf for faster, cleaner cutting with a hardened body that runs truer.Includes 1-7 1/4-Inch by 40 tooth smooth cut blade and 1-7 1/4-Inch by 20 tooth fast cut blade. Tough carbide tips for elytra durability Hardened body runs truer for easier straight cuts Anti-kick back feature for safe and smooth operation.