This BLACK DECKER Stackable Storage System is a 3-in-1 portable storage solution, which separates into 3 toolboxes in a matter of seconds. It includes an extra-large rolling tote for safe and convenient storage of power tools and bulkier items, a deep toolbox with removable tote tray ideal for storing hand tools, and a shallow toolbox for small parts and accessories. Each toolbox features an auto-lock front stacking latch for quick and easy connecting/releasing. Grab the piece you need for your project in the basement or effortlessly take the entire unit with you out to fix up the treehouse thanks to the telescoping handle and wheels.