Flap Discs ZA-Zirconia AluminaLong life., has the perk of finishing and grinding at the same time. Used for Stainless steel, high alloyed steel at medium and high pressure, grinding of polywood, chipboard and MDF plates. Grit range :#16,24,36,40,50,60,80,100,120,150,180,220.Available in the following sizes:100mm X 16mm (4” x 5/8”)115mm X 22mm (4.5” x 7/8”)125mm X 22mm (5” x 7/8”)150mm X 22mm (6” x 7/8”)180mm X 22mm (7” x 7/8”)