●Benchmark Abrasives 4-1/2" diameter and 7/8" arbor aluminum oxide resin fiber discs are commonly used for surface preparation, blending, chamfering, paint or rust removal, etc. ●These heavy stock removal discs are ideal for tough materials like metal & stainless steel. The strong and tough design of the discs provides consistent performance. ●The surface finishing discs have heavy-duty vulcanized fiber backing and heat-treated phenolic resins for increased strength, durability, and tear resistance. The superior design of discs minimizes loading, glazing, and grain stripping. ●High-performance resin fiber finishing discs are compatible with an angle grinder and should only be used with a backing pad and nut. Made of aluminum oxide grain that provides sharp and clean cuts. ●All of our abrasive products are made with quality materials and exceed both ANSI and EU European Standards. We trust in delivering high-quality products to the end-user. Customer satisfaction is the lifeline of our brand.