HSS wire shelving side bar is made of commercial grade steel. It has strong and durable welded wire construction with open collar design. Add 18" wide side bar with 6 hooks to your existing wire shelving unit without removing any wire shelves. It adds versatility to your shelving unit and letting you hang items like keys, bags, utensils and supplies. It fits on wire shelf with 18” wide. Easy to install without tools. Sold in set of 2.