The Metro TTM21S Track Shelving Kit is designed for efficient storage and mobility. This Super Erecta® Top-Track Mobile Unit Kit features a 21-inch width and includes essential components such as posts, casters, caster channels, donut bumpers, and roller bearing assemblies. The stainless steel finish ensures durability and a sleek appearance, making it suitable for various environments. Shelves are sold separately, allowing for customization based on your storage needs. Ideal for maximizing space and enhancing accessibility in any setting.