Edsal UR1848 Industrial Gray Heavy Duty Steel Boltless Shelving Storage Rack, 1000 Capacity, 48" Width x 72" Height x 18" Depth Standing five-shelf unit with a 16-gauge steel rack and shelves made of particle board to support a 1000-lb. per shelf 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 36" high units Rivet lock design for boltless assembly, instructions included, rubber mallet recommended for assembly (sold separately)