Heavy Duty 6-Shelf Metal Storage Rack Shelving Unit with CastersThis is 6 tier wire shelf, you only need to spend 15min to install it. This Heavy Duty 6 Shelf Metal Storage Rack Shelving Unit with Casters is made of steel wire shelving. Maximum weight capacity per shelf is 220lbs when equally distributed on feet levelers. Maximum entire unit weight capacity is 500lbs when equally distributed on casters. You can use the feet levelers or wheels to suit your needs. The storage rack provide an enormous amount of space