... 1)Air-proof, fire-proof, safe-proof and water-proof2)Sound insulation and heat insulation3)Environmental-friendly4)AutomaticA) Aluminium FrameMaterial: ... / security lock; D-handle lock/in lock/handle lock and etc.Hinges: new-style, reinforced hinge, thickned, widened, ... steel accessories---hinges, locks, handles, screws, installation bolt and etc.Packing: Foam Paper+carton, Pearl cotton+carton, wooden ...