An improved display bar assembly, for the cantilever support of product dispensing trays. A rectangular display bar, is supported by spaced apart, flat mounting brackets on which mounting hooks are located in the primary plane of the bracket, and openings for reception of the display bar are offset axially inward from that plane enabling the recessed accommodation of flanged retaining plugs at opposite ends of the bar. The flanges of the retaining plugs have axially extending abutment walls which overlap outer walls of the display bar and engage offset surfaces of the bracket. The abutment walls overlap display bar walls on two opposing sides only, enabling the retaining plugs to be molded with transverse friction fins. This in turn enables the use of readily available, inexpensive grades of light gauge (e.g., 16 gauge) steel tubing of greater height than width (e.g., 1×1.5 inch) for the display bars.