These Mobile Storage Racks are a perfect solution for organizing and maximizing your cluttered home or office storage space! The open design makes it easy to store bins, supplies, paper, etc. These handy rolling shelves give you the freedom to customize your storage area. Create isles or sections by combining four (5418) and two (5419) shelf units. Once the rack has been placed into position lock the casters to prevent movement when loading and unloading the shelves.