Shopsmith Conical Abrasive Discs are designed to work exclusively with the Shopsmith Conical Sanding System. The tapered, conical design of the Shopsmith Conical Sanding Disc provides a gentle sanding profile best suited for smoothing highly-figured or composite materials without chipping or tearout. The Conical Sanding System is also key to keeping your Shopsmith Planer and Jointer Knives sharp by using the conical disc and abrasives in conjuction with the Planer/Jointer Knife Sharpening Jig (555928). Our Aluminum Oxide Conical Sandpaper Discs are laser-cut from the same high-performing materials as our standard 12 Inch discs. 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. Includes (3) 12 Inch, 80 Grit, Adhesive-Backed A/O Sanding Discs.