Tennsco Add-A-Stack Shelving System Filing Tiers & Dividers Add-A-Stack Shelving System Grows with filing needs. Add-on tiers or shelves stack separately, creating flexible, expandable shelving. Start with a top and base—add as many tiers as needed. Each filing tier has four fixed dividers spaced 7" apart. Intended for use with open shelf filing supplies, but accepts standard file folders (not included). Assembly required. Filing Tiers (Shelves with Dividers) Letter size 36w x 13-3/16d x 10h. Two shelves per carton. Shpg. wt. 40 lbs. Light Gray