Works with an assortment of belt sanding machines and applications – providing a heavy duty stripping and sanding tool for wood, aluminum, fiberglass, rubber, plastic and non-ferrous metals. Made with our superior X-Weight clothed backing, an open coat aluminum oxide grain, and an impressive resin on resin bond that ensures long lasting performance. GRIT 40. Useable on ferrous or non-ferrous metals as well as plastics, fiberglass and wood, these belts are the most commonly sold due to their versatility and affordability. . built for general purpose grinding, sanding, polishing or deburring. Manufactured with premium aluminum oxide grains affixed to a strong backing