The uses for Benchmark Abrasives 2 inch A/O Quick Change Discs include but are not limited to: general purpose grinding, deburring, stock removal, cleaning up welds, removing paints, protective waxes and scale oxidation. Benchmark Abrasives Aluminum Oxide Surface Prepping discs are made with the highest quality Aluminum Oxide grains and use a threaded male, plastic roll on attachment for fastening.