Warehouse 5 Tier Racking Shelf Heavy Duty Steel Garage Shelving Unit Garden Shed Shelving, 2 sizesSturdy board & metal coating: Sturdy MDF boards use environmentally friendly 5mm thick E1 MDF material; the shelves are strong metal with heavy duty metal black coating, making the item more sturdy. Adjustable shelves height: The shelf has five tiers. The height of each shelf can be adjusted to meet your different needs. The shelves can be adjusted to a small distance to place small items, or remove the divider to form a large space to place large