What is the difference between abc-level lock cores?

The differences are as follows: The structure of the A-level lock core is that the key is flat or crescent-shaped with one row of concave key slots on one or both sides or a cross-shaped with convex key slots on four sides. The structure of the B-level lock core is that the key is flat or crescent-shaped, with two rows of concave key slots on one or both sides or cylindrical multi-point concave key holes. The structure of the C-level lock core is that the key is flat, with two rows of concave plus S-shaped key slots on one or both sides, or double snake-shaped key slots inside and outside.
What are the standards for ABC-level lock cores?
1. National standards for A-level lock cores: The number of keys for pin locks should be no less than 6x104, the number of keys for magnetic pin locks, blade locks, and lever locks should be no less than 2.5x104, and the number of differential exchanges is one; the theoretical number of keys for mechanical password locks should be no less than 1x106.
2. National standard for Class B lock core: The number of keys for pin locks should be no less than 3x104, the number of keys for magnetic pin locks, blade locks, and lever locks should be no less than 1x104, and the number of different exchanges is two; the theoretical number of keys for mechanical password locks should be no less than 6x107, and the actual number of keys that can be changed should be no less than 60% of the theoretical number of keys.
3. National standard for Class C lock core: Since it is an enhanced version of Class B lock core designed by the enterprise itself, the standard for this part is the same as Class B.