18" x 30" x 54" 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). ESD Wire Shelving Add-on unit includes 2 posts, 5 wire shelves, 16 S-hooks and a drag chain. Additional wire shelves and plastic conductive split sleeves may be purchased separately. Units with Add-On kit cannot be made mobile. Includes 2- 54" Posts, 5- 18" x 30" Chrome Wire Shelves, 16 S-hooks, plastic conductive split sleeves and a drag chain.