For sanding drywall joints and patching compounds and plaster to a fine finish, use the 3m 9094DC-NA Plaster and Drywall Sanding Screens. This workhorse of the construction trade cross-cuts and rips in solid wood, plywood, particle board, chipboard and other heavy-duty sawing. These drywall screens sand and contour irregular areas and can also be used on wood, metal, plastic and painted surfaces. They are made of water proof silicon carbide, a hard synthetic mineral and remove material quickly while resisting clogging and build-up. Each 3m sanding screen measures 9" x 11"; both sides may be used to extend the life of the product.