Heavy Duty 6-Shelf Adjustable Metal Shelving Rack with CastersThis is 6 tier wire shelf, you only need to spend 15min to install it. This Heavy Duty 6 Shelf Adjustable Metal Shelving Rack with Casters is made of steel wire shelving. Maximum weight capacity per shelf is 350lbs 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