Since you can attach add on units to any wire shelving kit, you only need to purchase the size that fits your space. Extend the length of your shelf or create a small storage nook in the corner. Just set S-Hooks onto the side of your existing shelf and use the metal curve to support your new shelves. Design upgrades storage without sacrificing needed floor space Attaches to existing chrome wire shelving units to extend the length of shelves Accommodates up to 500 lbs per shelf, evenly distributed Shelves adjust every 1" along posts Made for indoor use, dry storage only S-Hook 2-Packrequired per extra shelf To securely set or quickly remove shelves, tap their corners with arubber mallet. View ourWire Shelving Size Guideto see actual outer and inner dimensions. Availability:Ships next business day