... /brass sheet, preoxidized finish, with 12mm tempered Glass. Double leaf entry door(1) Material: 1.2mm copper/brass sheet outside with steel ... the chinese culture and lucky concept.(6) The surface of door panel: through many special and complex processs,such as soakage ... lab and speciall requirement of structure and quality for Security Door(like bank,cashbox),using net-like and parallel cold-rolled ...