Alera ALESW504818BL Industrial Heavy-Duty Wire Shelving Starter Kit, 4-Shelf, 48w x 18d x 72h, Black Ideal storage solution for industrial and commercial use. NSF food equipment certified. Strong welded wire construction. Can be set up as a four-tier single rack or as two two-tier racks to meet specific needs. Open design allows air circulation and reduces dust build-up.