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 convenienct hook & loop backing to make swapping out abrasives a snap! Must be used with the Shopsmith Hook & Loop Conversion Disc (555102). Pack Includes (6) 12 Inch, 100 Grit, Hook & Loop-Backed A/O Sanding Discs.