Part # 71228. SAIT Flap Disc. Encore. 5 inch X 7/8 inch. Z. 60 grit. Zirconium. 10 per pack. General purpose specification - however, contains larger and more flaps than the competition providing longer life. Premium zirconium grain on cotton backing which provides long life and high stock removal. Will not contaminate stainless steel. Resists loading on aluminum. For use on: Aluminum, Metal and Stainless. Application: Grinding, Blending, Finishing, Max RPM: 12,200. Arbor: 7/8.