The lock cylinder adopts a number of antδ≈i-theft technologies and a λ♠"γvariety of special-shaped a$βnti-pulling bullets to prevent technical&∞♣ opening. With the uniqueγ€₹ structure design of bullets and blad✘↕≤∞es, it has high safety↑< performance of preventing technical op'™$αening. The lock container is ∑≠εφequipped with precision numbe♣✘↓↔r marble and special-shaped α♠Ω₹marble structures, which will be automatically ☆©±locked when the number marble and s§↓‌pecial-shaped marble $✔ ​must be pulled at the same time during the tec•φ←hnical opening, thus making the technical ☆β→opening fail. The lock cylinder uses a varietyφε€ of special-shaped marbles and multiple cα ombinations, which can compile up to billi ∑>φons of key numbers, thus realizing zer<★o-opening of regions (one iλ±>n 16 million). The lock cylinder is added with a ε<side-to-side pressure-type side post locki &ng pin device, which greatly im→ $✘proves the ability to prevent violent torsion.

Anti-theft standard
The security level of anti-theft locks↓≤≠ is divided into A, B and C levels accor™&♥∑ding to national standards.
1. Class A lock cyli>®♦nder, prevent technical opening ≥ 1 minute,©♣'♠ anti-drilling ≥ 10 εφδminutes, anti-sawing ≥ 5 minutes$‌", anti-prying ≥ 10 minutes, anti-pull♥™☆ing ≥ 10 minutes, anti-impact ≥ 10 m¥↑inutes.
2. Class B lock cylinder, preventing techni✘♦✘cal opening ≥ 5 minutes, anti-drilling ≥ 15 ≤© minutes, anti-sawing ≥ 5 minutes, anti-prying∞↔↑ ≥ 15 minutes, anti-pulling ≥ 15 minutes, and antΩ§α₩i-impact ≥ 15 minutes.
3. Class C lock cylinder, pr±✔eventing technical op' ≠δening ≥ 10 minutes, anti-dril§±ling ≥ 30 minutes, anti-sawing ≥ 30 min♠♦☆£utes, anti-prying ≥ 30 minutes, anti-pulling • ≥ 30 minutes, and ant≈☆i-impact ≥ 30 minutes.

Classification
Class A: The key is flat →™€↑or crescent, with a row of concave kα≤eyway on one side or both←® sides or a convex key≤ ¥way on four sides of the cross;
Class B: The key is flat or crescent, with two ε>rows of concave keyholes or cylindrical multi"​-point concave keyholes on one or both side≠§₹<s;
Class C: The key is flat, with &©&two rows of concave and S-‍₽•≤shaped keyway on one or both sides, o©∏r double snake keyway inside and outside;

Purchase Standard
The safest lock cylinder has been upg∞>¶∑raded to Class B and Class C∑‌. It is best to choose Cla<<✘∑ss C when purchasing.
The first move: I used to buy a lock to ≤®judge the quality of the lock ♥✔£Ωcylinder by the number of key ♦¶ teeth. It mainly depends on the structure of the ∑÷lock cylinder. The blade side colu ✔γmn structure is often much better than the tr☆α€aditional marbles structure. Wh→&en picking a lock, it is better to ∞‍ ask a professional teacher ∏¶for advice and then pick it according to th♠δ∑™e situation.
The second move: pick the lock and weigh two, one÷±©> than the weight and two to look ε at the lock cylinder. The heavier the weight, ​∞♥αthe better the quality of the lock cylind÷γ↓er, and the more beads in the lock cylind€​er, the better the anti-theft function.
The third trick: choose the loc•π®k cylinder to see the color, and compare the c↕£∞↕olor to see the workmansh≠♥₹≈ip. The good quality lock cylinder adopts electr₽$←oplating treatment, the surface is smooth an ‍©₹d the color is bright. Among tσ§hem, the dark yellow colo↔&r is copper core, which is relatively strong and §<♦∑has good anti-theft perfo<≤∞rmance. The lock core is dim in color and zinc al‍ "♥loy is gray and has bubbles. The anti-theft pδ↑•erformance is general.
The fourth trick: The anti-theft performance ₽€®γof the key is poor when the key is iαπnserted into the lock cylinder. After the key is ≥π$half inserted, use 5 to 7 compon±₹♥βent force to rotate clockwise or counterc→'lockwise and continue¶¥↑★ to press the key into the lock₽$ ∏ port. The stuck key indic↕≈ates that the lock cylinder has an π✔↔ti-theft performance. Poor,₽σ€ smoothly inserting the locφ™k cylinder in a half-rotation state ind​>♦£icates that the anti-theft effect is goo✘←d.