Achieve aggressive material removal and an impeccable finish with RADNOR Zirconia Alumina Type 29 Flap Discs. The conical, angled profile maximizes surface contact for fast, light stock removal, supported by a heavy-duty fiberglass backing. Available in 4", 4 1/2", 5", and 7" sizes and a comprehensive 36, 40, 60, 80, and 120 grit range, these discs fit 5/8", 7/8", and 5/8" - 11" arbors to perform the work of both a heavy wheel and a fiber disc.