These premium aluminum oxide grain sanding discs are manufactured with the highest standards in the industry and are designed for heavy-duty sanding and grinding of wood， metal， fiberglass， and painted surfaces. The resin bonding system resists heat and moisture， which extends the useful life of the sanding discs.FeaturesThese very fine grit sanding Disc are ideal for sanding， de-whiskering， or scuffing in between coats of paint or varnishAluminum oxide durable grains are tough and durable， and are recommended by professionals for sanding a wide variety of materials including wood， metal， fiberglass， and painted surfacesThe hook and loop backing makes changing the sanding disc quick and easyFor use with the disc， orbital， and DA sanders with hook and loop attachment