This Edsal unit is a standing five shelf unit with a steal rack and shelves made of particle board. This unit has riveted beams and braces that lock into posts with rivet holes for structural security. You can adjust the posts at 1.5 inch. intervals. The steel rack has a black powder-coated finish to resist chipping and corrosion. The assembled unit is 72 x 48 x 24 inches (H x W x D). This shelf unit has a rivet lock design for boltless assembly. Edsal Manufacturing Company manufactures storage systems and industrial furniture. The company, founded in 1952, is headquartered in Chicago, IL.