... stainless steel, firm structure, flexible opening, security vault door:The vault door has beautiful appearance of stainless steel, firm structure ... for staffs.Door leaf structure from outside to inside is the following : the stainless steel plate which is 1 mm(1Cr18Ni9Ti), 8 mm ... stainless anti drill plate ,,60 mm fireproofing layer (including the 8 ANJIU alloyed anti drill plates),3 mm closure plate ...