In different application setups, there are different configurations for electrical cross arm. The mate- rial is steel. Finish: Hot-dip galvanized.Standard: ASTM123-78 Size(mm) Finish Approximately Weight (Kg./Pcs.) 65x65x6x508 Hot dip galvanized 2.53 65x65x6x965 Hot dip galvanized 5.6 50x50x4x508 Hot dip galvanized 1.53 50x50x4x965 Hot dip galvanized 2.8