Conductive ESD 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 wire shelves, 16 S-Hooks, plastic conductive split sleeves and drag chain. Additional shelves and aluminum split sleeves may be purchased separately. Units with Add-On kit cannot be made mobile. Includes 2- 63" Posts, 5- 21" x 60" Chrome Wire Shelves, 16 S-hooks, plastic conductive split sleeves and drag chain.