Metro SPN 3-Shelf Stainless Utility Carts. To best meet your needs, you can select any combination of shelves from many types, finishes, and sizes. Utilizing them with any of Metro's stem casters.  Heavy-duty, highly maneuverable. These carts can handle and distribute a large volume of material safely and efficiently. Easy to assemble with positive placement and makes relocation of shelves quick and straightforward. 5" swivel with resilient tread. Donut bumpers are included with casters—one-piece handles.