These mobile Metro Shelving units are very sturdy and convenient. They are available in 4ft, 5ft, and 6ft configurations. Both options are 2ft deep and are available in 4 tier or 5 tier configurations as well. This is an excellent utility cart with durable polyurethane casters that allow for increased weight capacity and reliability. Metro Industrial Wire Shelving Shelves can be repositioned at precise 1" increments along the length of the numbered posts.