From the manufacturer
DWST17814 TSTAK Deep Toolbox
The TSTAK deep box with flat top offers new innovation in storage options. This flexible platform allows different combinations; all units can stack on top of each other and able to connect with durable side latches for easy carrying and safe stacking. This unit can be used for storage of corded and cordless tools and features a removable tray for access to essential tools. Heavy-duty metal latches and hinges are built for durability.