The CA-BELT-AL 3 X 21 120G PK10 from Field Tool Supply is a pack of aluminum oxide sanding belts designed for use in belt sanders. Each belt measures 3 inches by 21 inches and features a 120-grit finish, making it suitable for medium sanding tasks. The aluminum oxide material provides excellent durability and a consistent finish on various surfaces, including wood and metal. This pack of 10 belts ensures you have plenty of replacements on hand for your sanding projects. Ideal for woodworking, metalworking, and automotive applications, these sanding belts are a reliable choice for professionals and hobbyists alike.