Modular filing system expands with your needs. Start with a Top & Base Unit, then add as many Filing Tiers as needed. Easy to install & expand; add another level simply by removing the top & stacking on another tier. Heavy-duty, reinforced steel shelves hold letter size files or folders. Sturdy steel dividers, four per shelf, are welded between frame & shelf for stability; rolled edges for safety & embossed structural ribs for strength. Creates flexible expandable shelving. Order one unit for each stack of tiers. Color: Light Gray; Overall Width: 36"; Overall Depth: 13 3/16"; Overall Height: 1".