Yaheetech 5 Tiers Carbon Steel Wire Rolling Wheel Racks & Stands Shelving Organizer Shelf Super durable, adjustable interval height Sturdy and rust-resistant heavy duty steel frame construction Material: carbon steel Approximate Size: 29.5" x 13.8" x 59.1"((W & D & Max. H)) 2 locking, 2 non-locking Secure - 2 locking wheels keep the rack in place