Crafted from a proprietary material mix for long wheel life, Dewalt Type 1 HP metal cutting abrasive saw blades feature aluminum oxide grain for fast cutting. 2 full sheets of fiberglass offer strength and safety. Diamond knockout arbor for use with worm drive saws. Aluminum oxide grain for long life and fast cuttingProprietary material mix ensures durable long life wheelsProprietary material mix ensures durable long life wheels