Ideal for meat and produce departments, food service and non-food processing, transport and assembly applications. Lifetime Warranty Against Rust. The carts are constructed of rustproof all welded aluminum (AL) or stainless steel (SS) with no nuts or bolts to loosen. Platter are held securely on 1″ angle runners. 6″ spacing between runners. Maneuvers easily on four 5″ heavy duty polyurethane swivel stem casters.