This Edsal UR3672 steel shelving unit has a frame made of 16-gauge steel for strength, five adjustable shelves made of particle board, and an industrial gray baked enamel finish for resistance to corrosion. It is suitable for organizing and storing items. The shelves are supported by double-riveted beams and braces for strength, and adjust in 1-1/2" increments to accommodate items of varying heights.The posts on this shelving unit have a two-piece design so it can be assembled vertically to create one 72 x 72 x 36 inch (H x W x D) unit, or assembled horizontally to create one 36 x 72 x 36 inch (H x W x D) unit with two shelves, and one 36 x 72 x 36 inch (H x W x D) unit with three shelves. (H is height, the vertical distance from lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back.) This shelving unit has a 600 lb. capacity when the weight is evenly distributed across the shelves. This shelving unit"s rivet lock design requires no nuts or bolts for assembly. Assembly instructions are included, tools for assembly are not included.Edsal Manufacturing Company manufactures storage systems and industrial furniture. The company, founded in 1952, is headquartered in Chicago, IL.What"s in the Box?(5) Shelf, particle board, 72" x 36" (W x D)(8) Upright post, 36" (H)(10) Beam(10) BraceAssembly instructions