Need an effective storage solution for contents of varying sizes. The choice is clear. This Luxor Double-Row Mobile Bin System comes with a mix of four 6 inch-deep and eight 3 inch-deep polypropylene tubs. Clear plastic bins add convenience by making it possible to see the contents without opening the drawers. Each tub is capable of holding up to 20 lbs., making this system great for storing items both large and small such as classroom supplies, garage tools and parts, or other daily essentials. A steel frame, sturdy guide rails and a built-in safety feature keep bins securely in place while using the bins or moving the unit. And its easy to maneuver thanks to four rolling casters, two with foot-activated brakes. If your storage needs change over time, you can replace a 6 inch bin with two 3 inch bins or vice versa (additional bin kits sold separately).