Our shelving is designed for heavy-duty use. The boltless design allows for quick & easy assembly. The powder-coated finish is rust resistant & durable. The shelving unit can be assembled either horizontally or vertically, depending on your storage needs. Each unit includes black laminate decking. Assemble with a rubber mallet in less than 30 minutes. Shelving is made of heavy-duty riveted steel construction. Series Name: Alera 3200 Series Shelving; Number of Shelves: 4; Shelf Depth: 18"; Shelf Thickness: 5/16".