United Abrasives- SAIT 17050 Pak Stack Combo, Metal Blending, Grinding, Finishing and Cutting Discs, 4-Pack One aluminum oxide grain A24R depressed center grinding wheel One Saitlam general purpose flat disc has a flat shape ideal for use on miter joints, corners and edges Three 2A aluminum oxide fiber disks for general use that has closed coat structure for more material removal and better finishing One 22021 general depressed center grinding wheel Great sample / test package for small and large jobs