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Benchmark Abrasives Aluminum Oxide Resin Fiber Discs are designed for blending edges, seams and corners, weld grinding and deburring. They are made by electrostatically depositing grains of Aluminum Oxide on heavy duty vulcanized fiber backing with heat-resistant phenolic resins. These discs are resistant to heat, plus resistant to glazing and loading, and are excellent on ferrous and non-ferrous metals. Our fibre discs feature a full resin bond system with heavy-duty fibre backing for increased strength, durability and tear resistance. Manufactured to O.S.A. Safety standards., long life and high performance all come as standard.