United Abrasives SAIT 50148 High Performance Fiber Disc for Stainless and Aluminum – 3A Aluminum Oxide with Grinding Aid – SAIT-LOK Quick Change 5/8-11 Hub (Diameter 4-1/2″ Arbor 5/8″-11 Grit 36 Type Custom Disc: Minimum Order is 150 Pieces Max RPM 13300)