Do you need to sand concrete countertops but don't want to spend the money to buy a brand new wet grinder. Concrete Countertop Solutions has a solution for you. Our Z Grit-Discs are made out of a high quality silicon carbide sand paper that will hold up on the toughest sanding surfaces. Use Z Grit-Discs to smooth and polish your countertops or to round any sharp, jagged corners. Z Grit-Disc comes in 6 different grits 60, 80, 120, 220, 320, and 400. They can also be used on other hard stone surfaces such as marble, limestone, and tavertine. Z Grit-Disc will fit all 5" 8 hole hook and loop orbital sanders. Purchase them by the 10 pack or pick up the mixed grit 60 pack.