Steel Shelving with Particleboard Shelves, Four-Shelf, 30w x 16d x 60h, Steel, Black Shelving is made of heavy-duty riveted steel construction. Shelves adjust in 1.5" increments to accommodate items of varying heights. Assembles vertically or horizontally. Assembles with a rubber mallet (not included). Durable powder-coated finish is rust resistant. Riveted steel construction.