The Metro TTM21K3 Track Shelving Kit is designed for efficient storage and mobility. This Super Erecta® Top-Track Mobile Unit Kit features 21-inch wide epoxy-coated corrosion-resistant posts, enhanced with Microban® antimicrobial protection to inhibit the growth of bacteria. The kit includes durable casters and caster channels for smooth movement, along with donut bumpers and roller bearing assemblies for added stability. One kit is required per mobile unit, with shelves sold separately, allowing for customizable storage solutions tailored to your needs.