Our Mercer aluminum oxide resin fibre discs are made with heat-treated aluminum oxide grain, resin on resin bonded to a vulcanized fibre backing. Mercer’s resin fiber discs are widely used in the construction, industrial manufacturing, fabrication and welding industries. These aluminum oxide resin fibre discs discs are available in 16 grit through 120 grit for all brands of 4" through 9" sanders and grinders. They offer a strong long life with high stock removal and are cool cutting with resistance to heat and moisture. These resin fibre discs are great for stripping paint on metal, wood and fiberglass as well as perfect for deburring, polishing and grinding.