The lock cylinder adopts a number of anti-theft technologies and a variety of special-shaped anti-pulling bullets to prevent technical opening. With the unique structure design of bullets and blades, it has high safety performance of preventing technical opening. The lock container is equipped with precision number marble and special-shaped marble structures, which will be automatically locked when the number marble and special-shaped marble must be pulled at the same time during the technical opening, thus making the technical opening fail. The lock cylinder uses a variety of special-shaped marbles and multiple combinations, which can compile up to billions of key numbers, thus realizing zero-opening of regions (one in 16 million). The lock cylinder is added with a side-to-side pressure-type side post locking pin device, which greatly improves the ability to prevent violent torsion.

Anti-theft standard
The security level of anti-theft locks is divided into A, B and C levels according to national standards.
1. Class A lock cylinder, prevent technical opening ≥ 1 minute, anti-drilling ≥ 10 minutes, anti-sawing ≥ 5 minutes, anti-prying ≥ 10 minutes, anti-pulling ≥ 10 minutes, anti-impact ≥ 10 minutes.
2. Class B lock cylinder, preventing technical opening ≥ 5 minutes, anti-drilling ≥ 15 minutes, anti-sawing ≥ 5 minutes, anti-prying ≥ 15 minutes, anti-pulling ≥ 15 minutes, and anti-impact ≥ 15 minutes.
3. Class C lock cylinder, preventing technical opening ≥ 10 minutes, anti-drilling ≥ 30 minutes, anti-sawing ≥ 30 minutes, anti-prying ≥ 30 minutes, anti-pulling ≥ 30 minutes, and anti-impact ≥ 30 minutes.

Classification
Class A: The key is flat or crescent, with a row of concave keyway on one side or both sides or a convex keyway on four sides of the cross;
Class B: The key is flat or crescent, with two rows of concave keyholes or cylindrical multi-point concave keyholes on one or both sides;
Class C: The key is flat, with two rows of concave and S-shaped keyway on one or both sides, or double snake keyway inside and outside;

Purchase Standard
The safest lock cylinder has been upgraded to Class B and Class C. It is best to choose Class C when purchasing.
The first move: I used to buy a lock to judge the quality of the lock cylinder by the number of key teeth. It mainly depends on the structure of the lock cylinder. The blade side column structure is often much better than the traditional marbles structure. When picking a lock, it is better to ask a professional teacher for advice and then pick it according to the situation.
The second move: pick the lock and weigh two, one than the weight and two to look at the lock cylinder. The heavier the weight, the better the quality of the lock cylinder, and the more beads in the lock cylinder, the better the anti-theft function.
The third trick: choose the lock cylinder to see the color, and compare the color to see the workmanship. The good quality lock cylinder adopts electroplating treatment, the surface is smooth and the color is bright. Among them, the dark yellow color is copper core, which is relatively strong and has good anti-theft performance. The lock core is dim in color and zinc alloy is gray and has bubbles. The anti-theft performance is general.
The fourth trick: The anti-theft performance of the key is poor when the key is inserted into the lock cylinder. After the key is half inserted, use 5 to 7 component force to rotate clockwise or counterclockwise and continue to press the key into the lock port. The stuck key indicates that the lock cylinder has anti-theft performance. Poor, smoothly inserting the lock cylinder in a half-rotation state indicates that the anti-theft effect is good.