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. Bright, chrome over nickel electro plating creates a brilliant high gloss finish. 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 one year warranty against rust and corrosion.