Mac Tools offers 3 bolt on accessories for teh Tech Series Toll Box including: the Corner Workstation, the Work Surface Fram, and the 50 inch bookcase unit. Corner Workstation is designed to bolt between two Tech Series bottom boxes. The 50 inch Bookcase Unit can be bolted atop any workstation 50 inches or larger. the Work Surface Frame can be bolted to either side of the Tech Series Workstation for even more space. Add space and customization to your Tech Series tool box with these new Mac Tools options.