No need for separate connectors. Units self-interlock with each other to expand your system. Drawers remove and have handles for easy transport. Holds 27 CDs, 80 3.5" diskettes, 26 Zip® disks or other media—alone or in combination. Drawer front labels, adjustable dividers included. Plastic. 7-1/16w x 12-3/4d x 7-3/16h.