The Cosco 4-Shelf Storage Unit is a multi-purpose shelf that can be assembled quickly without the need for tools. You just fold the frame out and clip the shelves in. You can use this folding shelf in your garage, basement, laundry room, work room, warehouse or office. The black shelving unit can hold up to 250 lbs of weight per shelf, allowing you to store just about anything. It is made from powder-coated steel, giving it strength and durability, and there are also no jagged edges or sharp areas. This instant folding shelving unit offers the unique ability to configure multiple Cosco shelving units together (sold separately) by stacking and/or linking them side by side.