SAIT 50278 Laminated Disc, Premium aluminum oxide grain with grinding aid. Fast stock removal. Cooling agents for cool cutting and long life. Excellent edge grain retention. Nylon screw threaded hub for easy mounting to the backing pad. 2-ply construction is rugged enough for contoured surfaces or flat surface. Universal style backings fit most major backing pad brands on the market. For use on stainless and metal. United Abrasives is a world leader in manufacturing a broad range of grinding wheels, cutting wheels, coated abrasives, carbide burs, wire brushes, specialty products and much more.