Shopsmith Complete Disc Sanding Package is a game-changer in workshop efficiency! Add two additional 12 Inch Steel Sanding Discs to your workshop and use Shopsmith 12" A/O Sanding Discs in different grits to make progressive finishing as easy as swapping out your sanding disc. 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. Complete Disc Sanding Package Includes (2) 12 Inch Steel Sanding Discs & (18) 12 Inch Adhesive-Backed A/O Sanding Discs (6) 100 Grit, (6) 80 Grit, and (6) 60 Grit .