These premium aluminum oxide grain sanding discs are manufactured with the highest standards in the industry and are designed for heavy duty stripping and preparing primed and painted surfaces from metal for finishing, sanding of plastics, fiberglass and composites, light weld blending, preparing and finishing metal, and sanding gel coat and body filler compounds. For use on wood, metal, drywall, fiberglass, or painted surfaces The anti-clog stearate coating reduces particle build-up, keeping the grain exposed longer and improving performance The stick-on adhesive holds securely without slipping so you can smooth large surfaces Made from heavy duty sandpaper, these resin-bonded sanding discs are designed for power tool sanding