Get more from your existing storage. Extend the length of your shelves with an add-on kit and stay organized. Design adds storage without occupying too much floor space Attaches to existing chrome wire shelving units to extend the length of shelves Accommodates up to 400 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