Shopsmith Aluminum Oxide Sandpaper Discs cut fast, resist build-up, and outlast the competition. These discs are workhorses in the shop, easily handling tough sanding jobs, tool sharpening, and more with superior durability and performance. Made with a durable, open coat Aluminum Oxide (A/O) abrasive that is fast-cutting and resistant to loading for a longer life. Assorted Pack Includes (6) 12 Inch Adhesive-Backed A/O Sanding Discs (3) 100 Grit, (2) 80 Grit, and (1) 60 Grit .