SafeRacks NSF Commercial Grade Adjustable 4-Tier Steel Wire Shelving Rack with Wheels - 18" x 48" x 72" COMMERCIAL GRADE: Ideal storage solution for all your heavy-duty commercial storage needs EXTRA LARGE STORAGE CAPACITY: 48" Wide x 18" Deep x 76" High (with 4" wheels) NSF CERTIFIED: NSF/ANSI Standard 2 - Food Equipment for use in dry environments EASY ASSEMBLY: Shelves slide on top of clips that keep it in place, allowing you to adjust the shelf height. For your safety, SafeRacks recommends making sure the shelves are flipped the right way to completely fit over and cover the plastic clips MOBILE: Hi-Capacity Wheels (4-inch diameter) allow for easy positioning in the kitchen, garage, or office