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SAIT 50030 Blue Line Fiber Disc, 2A Aluminum oxide. General purpose, closed coat structure for more material removal and better finishing. Resin over resin construction for a strong bond that is resistant to heat and moisture. Vulcanized Blue Line Fiber backing for heavy duty sanding. For use on ferrous and/or non-ferrous metals and wood. 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.