5 Tier Racking Shelf Heavy Duty 150x75x30cm Steel Garage Shelving Unit Garden Shed Shelving BlueSturdy board & metal coating: Sturdy MDF boards use environmentally friendly 5mm thick 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 items.