Diablo's premium metal grinding discs provide superior performance and increased productivity. Featuring a premium aluminum oxide blend, these discs grind through material faster than other discs and offer an extra long grinding life. Premium aluminum oxide blend - a superior quality formulation designed for fast material removal and long cutting life.For use on metal applications including steel, stainless, cast iron and sheet metal.Type 27 depressed center.Fully reinforced for use in hand-held cut-off work.Ideal for working in hard to reach areas.