SAIT 70071 Flap Wheel, premium aluminum oxide grain, general purpose, excellent for cleaning, deburring, polishing, blending. For use on metal, aluminum and wood. Resin over resin construction for a strong bond resistant to heat and moisture. Closed coat structure for more material removal. High quality Egyptian cotton cloth backing provides superior durability. 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.