1.low cost 2.easy for line check and cleaning 3.fast heat dispersion 4.flexible and fast installation. Standard :JB/T10216-2000 NEMA:VE1Material:PG.processed after HDG.SSThe cable tray uses automatic stamping controlled by PLC roll-forming over the line one -time,floor uniformpunching,improve ventilation,thermal properties,surface treatment for HDG. Perforated trough cable tray