Cable trays are divided into grooved cable trays, tray cable trays and step cable trays, grid trays and other structures, consisting of brackets, bracket arms and installation accessories. Can be set up independently, can also be laid in a variety of buildings (structures) and pipe corridors on the support, reflecting the simple structure, beautiful shape, flexible configuration and easy maintenance and other characteristics, all the parts need to be galvanised, installed outside the building in the open air bridge, if it is in the vicinity of the seashore or belongs to the corrosive zone, then the material must be anticorrosive, moisture-resistant, good adhesion, high impact strength of the physical characteristics.