What is the difference between the security level and the B level?
Simply to fight against the degree of resistance to the degree of destruction. Class A is the most solid, the door of the material the most solid. And so on
This is a time, and the time of class B is 45 minutes. The time is 15 hours. The The And Class A keyhole is 12, B has 10
Class A and B doors of the thickness of the plate, the allocation of the same kind of muscle chicken crown class wine Jiu Jiu helium Mo, in addition to the cylinder, Class A are super B-class, B is B-lock, but now some brands Ding-level door is also used in the ultra-B-lock (such as new), so this is a class B nothing on the difference between the market is more common is a, C, D three levels
