Abstract: An adjustable, multi-element system for the mounting of display cases or containers on shelving. The system has two parts: a bracket assembly and a display case back wall to be used in conjunction therewith. The bracket assembly is comprised of a bracket arm, a retainer plate, and a mounting plate, onto which the display case or container locks. The retainer plate is adjustable relative to the bracket arm, whereby shelves of varying dimensions may utilize this system. These three elements are removably joined together by a wing nut and a bolt. The remaining element of this system is a sheet of material, which can be sized to serve as the back wall of display containers of various kinds, and which has an opening in it shaped complementarily to a projection from the mounting plate, whereby display cases utilizing this design may be locked onto the mounting plate.