Add-On Shelving Units allow unit expansion to make the most of storage space. Includes 2 posts with leveling feet, 4 shelves, Snap-On sleeves and S-hooks to join units. Stainless Steel provides stability and durability with a smooth, attractive, electro polished finish. Steel is designed to handle extreme wet, hot or cold environments. Rust and Corrosion resistance make these ideal for any storage requirement. Open design maximizes air and light circulation and minimizes dust accumulation. Shelves easily adjust without tools and align accurately at 1" increments. Shelf clips snap on post, allowing shelf collar to slide over for a secure fit. Limited lifetime warranty against rust and corrosion.