QEP 400 Polishing Grit Diamond Sanding Block is a versatile tool to fine-polish tile, stone, granite, glass, ceramic, and marble. It is 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. It can be used to polish granite countertops, remove small imperfections and light scratches, helping to maintain the visual appeal of the surface. Durable, it can be used wet or dry, and rinsed after use to use it again.