The suspension bar is prepared to accommodate the relative bracket, which is fixed thereto with no use of fasteners. The rare side is constituted by a particular double lock preventing the bracket from shifting upwards and assuring thereby a major reliability. The shape of width brackets provides a high stability and a great load capacity. The bracket has been designed for use with C5 metal trays and F5 mesh trays. In fact, its upper side is provided with special tabs, which are slide onto the wire and bent over it, mounting the tray in a quick and reliable way.