DEWALT TSTAK is comprised of 6 modular storage units and a Cart for ultimate organization for professionals and advanced DIYers to organize their tools.
The units are sold separately but have inter-connecting capabilities so they all attach to one another; therefore users can create their own unique tool box depending on their needs.
More Information: http://www.dewalt.com/tools/hand-tools-storage-and-work-support-organizers-dwst17807.aspx