4-inch Silicon Carbide Sand Paper with Hook & Loop Vel-cro backing good for sanding almost everything from stones, glass to steel... pack of 20 4-inch Silicon Carbide  Sandpaper Hook & Loop Pack of 20. Choose any grit: #80, #120, #220, #320, #400, #600, #800, and #1200,   Excellent for Grinding and Polishing Natural and Artificial Stones like Granite, Concrete, Marble, Travertine, Quartz, Terrazzo, Glass..., as well as Metal