Alera ALESW504824SR Industrial Heavy-Duty Wire Shelving Starter Kit, 4-Shelf, 48w x 24d x 72h, Silver Ideal storage solution for your heavy-duty storage requirements. National Sanitation Foundation (NSF) certified for dry environments. Snap-together design assembles in minutes. Shelves adjust in 1" increments. 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.