The lock cylinder key is divided into grades, including A grade, B grade and C grade. Among them, the A-level lock cylinder is the weakest, and the C-level is the highest level. So how to distinguish between A-level lock, B-level lock and C-level lock? How long can a thief open them?

A-level locks mostly use one-key keys or cross keys. Crescent locks and most lock cylinders have only one row of marble structure locks. The internal structure is very simple, only by changing the marble to lock and unlock, the number of marble slots is small, and it is very shallow, and the mutual opening rate is also very high. Tested by professionals, the technical unlocking time of Class A locks is within 30 seconds.The shape of the A-level lock key is flat or crescent-shaped, with a row of concave keyways on one or both sides or a cross-shaped convex keyway on all four sides

B-level lock is a flat plate type with double rows of billiard slots. Compared with the A-level lock, a row of curved irregular lines is added. There are three types of lock cylinders: computer double-row lock cylinders, double-row crescent lock cylinders, and double-sided blade lock cylinders. Tested by professionals, the technical unlocking time of Class B locks is more than 5 minutes and less than 120 minutes.

The shape of the B-level lock key is flat or crescent-shaped, with two rows of concave keyways or cylindrical multi-point concave keyholes on one or both sides;

According to relevant surveys, 90% of thieves will give up if they cannot open the door lock within a minute, so although the B-level lock is not the highest level, the security is much higher than the A-level lock.

C-level key is a double-row, computer, compound curve slot patent key. In theory, the technical unlocking time can reach more than 270 minutes, which is the lock core with the highest safety factor.

Unless violent damage, the possibility of theft is very high small.