Conductive Chrome Wire Shelving Add-On kit allows you to expand your Starter kit by sharing a set of posts. Configuration options include straight line, back to back and right angles (L-Shape). Add-On kits come complete with 2 posts, 5 shelves and 16 S-Hooks, plastic conductive split sleeves and drag chain. Additional shelves and plastic conductive split sleeves may be purchased separately. Units with Add-On kit cannot be made mobile. Includes 2- 74" Posts, 4- 21" x 72" Chrome Wire Shelves, 16 S-hooks, plastic conductive split sleeves and Drag Chain