Edsal UR60-BLK Heavy Duty 16-Gauge Steel Boltless Shelving with 5 Shelves, 5000 lbs Capacity, 60" Width x 72" Height x 18" Depth, Black Standing five-shelf unit with a 16-gauge steel rack and shelves made of particle board to support a 5000 lbs total capacity Double-riveted beams lock into double-rivet holes on corner post for structural security Corner post rivet holes are punched at 1-1/2" intervals for precise adjustment to shelf height Two-piece post design for vertical assembly of a single 72" high unit, or for horizontal assembly of two 30" high units Rivet lock design for boltless assembly, instructions included, rubber mallet (sold separately)recommended for assembly