Add-on shelving extends the length of your current wire storage shelf, requiring less posts and allowing more unique storage configurations. Add-ons can be attached at right angles using the included S-Hooks. Extends the length of current wire shelving units Provides end-to-end or straight-line storage for easy access to items 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.