Industrial strength cart is ideal for many industrial and commercial material handling applications. Set of 2 swivel and 2 rigid 5-inch by 1-1/4-inch heavy duty casters allow for 550-Pound load capacity. Fast assembly. Choose Quantum Storage Systems for the largest selection of bins and bin storage systems. From stackable storage bins to nesting shelf bins to industrial, material handling, and consumer totes and containers, our injection molded bins and complete bin systems offer a storage solution in any requirement. Gray.