Shopsmith 3" x 21" 120 Grit Premium Ceramic Grain Sanding Belt. The sanding belt is made with a sharper ceramic grain to allow the belt to cut faster and run cooler during sanding. Ideal for raw surface preparation on wood, drywall, fiberglass and metal. Designed to be used on power belt sanders and bench top sanders. Can last up to 4 times longer than traditional sanding belts. Use on wood, metal, fiberglass & painted surfaces.