Heavy Duty 4-Tier Corner Storage Rack Shelving Unit with CastersCompany Policy. BEFORE PLACING YOUR ORDER CONTACT US SO WE CAN CONFIRM AVAILABILITY AND OER YOU A DISCOUNT CODE. YOU MAY DO THIS VIA CHAT OR EMAIThis Heavy Duty 4 Tier Corner Storage Rack Shelving Unit with Casters is perfect to maximize any corner space. It can hold any of your boxes, cookware, tools, and everything in between. Heavy Duty 4 Tier Corner Storage Rack Shelving Unit with Casters Minimum Shelf Height Top to Bottom1'' Maximum Shelf Height