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. Discs have adhesive backing and can be attached directly to your Sanding Disc Plate. Purchase additional Sanding Discs to have one of each grit ready to go. Pack Includes (6) 12 Inch, 100 Grit, Adhesive-Backed A/O Sanding Discs.