What does Buyang Grade A security door by mean

Each security door in Buyang has a corresponding level of steel seal, which can be distinguished according to the steel seal.

The anti-theft door is divided into grades, the thickness of the Grade A security door is about 2 mm, the security door is used in fire and sound insulation, heat insulation and thermal insulation performance of aviation honeycomb aluminum or aluminum silicate rock wool, etc., like the anti-theft performance of the lock of the Grade A security door is B-level, which is what we call the advanced protection level, the Grade A anti-theft door will be more durable.

Security doors are now hierarchical, A. Second. Third.

Fourth.. The best is Grade A. >>>More

That is, the thickness of the door leaf is 12mm, and you can measure the door leaf.

That refers to the fact that there is a process in the pattern, which is convex after being recessed, showing a three-dimensional effect.