The Edsal UR245-BLK is a standing five-shelf unit with a steel rack and shelves made of particle board. This unit has riveted beams and riveted braces that lock into corner post rivet holes for structural security. The corner post rivet holes are punched at 1-1/2" intervals for precise installation of shelves at desired height. 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). (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 shelf unit has a rivet lock design for boltless assembly. Assembly instructions are included. A rubber mallet (sold separately) is recommended for assembly.