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). Folding Machine Type: N/A; For Mimumim Sheet Size: N/A; For Maximum Sheet Size: N/A; File Shelf/Component Type: Top/Base.