By connecting this add-on wire shelving to your current12"d starter solution, you can enhance the functionality of your storage. Attaches to existing starter unit to extend length of shelves for more storage space Durable chrome-plated steel construction 500 lb capacity shelves can be adjusted easily in 1" increments 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