DEWALT DW3532 8-Inch X 1/8-Inch Conc/Msry  Abrasive Saw Blade, 25-Pack Premium silicon carbide grain for long life and fast cutting Proprietary material mix ensures durable long life wheels 2 full sheets of fiberglass for durability and safety Diamond knockout arbor for use with worm drive saws Abrasive Material: Silicon Carbide