Need a little variety in your storage solutions. This Luxor Double-Row Mobile Bin System holds a mix of four 6 inch-deep and eight 3 inch-deep polypropylene tubs. 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.