The 3M™ Diamond Cloth Belt 641WY is designed with micron-graded diamond, a long-lasting resin bond, and a durable, water-resistant X-weight cloth backing. This combination of high-performance materials helps make this belt an ideal choice for working on ceramics, carbide, cast iron, and other hard-to-grind materials. Don't compromise — reach for the 3M™ Diamond Cloth Belt 641WY for your next task.Uniquely engineered to tackle the toughest jobs, the 3M Diamond Cloth Belt 641WY has micron-graded diamond particles encapsulated in a ceramic bead, meaning that as the ceramic erodes, diamond particles continue to be exposed. This makes it extremely useful in grinding and polishing hard materials for its unique ability to produce excellent surface finishes combined with high removal rates. Wet or dry, rely on the 3M Diamond Cloth Belt 641WY for a quality finish on a variety of substrates.