SAIT 51345 Bulk Fiber Disc, 9S Ceramic with grinding aid. High performance, ceramic aluminum oxide grain, closed coat. Grinding aids for reduced heat and decreased loading. Excels in heat sensitive material - stainless steel and non-ferrous metals. Exceptional performance and value. Excels on tough to grind materials. Resin over resin construction for a strong bond that is resistant to heat and moisture. Vulcanized fiber backing for heavy duty sanding. For use on stainless, metal, and aluminum. 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.