The QEP® Diamond Sanding Blocks are a versatile tool to smooth tile, stone, granite, glass, ceramic, and marble. They are manufactured with superior brazed diamond bonding, and a lightweight foam base that makes it flexible and easy to use in hard to reach places, corners, and edges. These sanding blocks are a must-have for contractors in stone fabrication, restoration as well as counter top production. There are four grits; coarse, medium, fine and polishing grit. Choose the right grit for your application. Durable, they can be used wet or dry, and rinsed after use to use it again.