C.L. Industries HYDDISC80D7RES 7" Resin Polishing Pad 80 Grit, these abrasives have foam-backing pads with Velcro, allowing operators to change discs quickly and efficiently. When working with water or air driven tools on marble, quartz or pebble-based finishes, diamond abrasives are the best choice for grinding, sanding, and polishing with ease. Choose from abrasives available in a variety of sizes and rigidity depending on the application and specific job requirements.