The CRL CRL3X21220X Glass Grinding Belts are high-quality sander belts designed specifically for grinding glass. With a size of 3″ x 21″ and a material composition of glass, these belts are perfect for precision sanding and shaping of glass surfaces. This box includes 10 belts, providing a durable and long-lasting supply for your grinding needs. The CRL brand is known for producing reliable and professional-grade tools for the building materials industry, making these grinding belts a trusted choice for glassworkers and artisans.