Make the most of your empty space and existing unit with a convenient add-on kit. This product is supported by freestanding units with the help of S-Hooks, either end-to-end or at a right angle from the front of the unit. Design provides additional storage without using too much floor space Attaches to existing chrome wire shelving units to extend the length of shelves Holds up to 800 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