For transporting and storage of all types of products, these work saving mobile carts minimize lifting and carrying. Cut down on product handling time. Lifetime Warranty Against Rust. Carts are sanitary and easy to clean. The carts are constructed of rustproof, all-welded aluminum (AL) or stainless steel (SS) with no nuts or bolts to loosen. The carts have 10″ spacing between runners. Maneuvers easily on four 5″ heavy duty polyurethane swivel stem casters.