The lock cylinder adopts a±↑÷$ number of anti-theft technologies and a va• §¥riety of special-shap±♠ed anti-pulling bullets ♠£to prevent technical opening. With the uni♥♦γque structure design of bullets and b$≠λlades, it has high safety perf♣☆​♦ormance of preventin‌γ↕αg technical opening. The lock con∏¶π&tainer is equipped with prec™£‌ision number marble Ω♣×and special-shaped marble structures, which wiβ≠ ₩ll be automatically locked when the number ma₹™♠rble and special-shaped marble m¥λ ↔ust be pulled at the s§₩∏λame time during the technical opening§↔, thus making the technical opening fail. The loc♣±₩k cylinder uses a var☆₽&iety of special-shaped mar>♥•bles and multiple combinations, which can c"Ω₽λompile up to billions of key numbers,€₽ thus realizing zero-opening of regions (one in "$©§16 million). The lock cylinder isγΩ added with a side-to-side pressure-type side pos↕∞₹t locking pin device, which gre£•×atly improves the ability to prevent v• σ®iolent torsion.

Anti-theft standard
The security level of anti-theft locks is₽¥↑< divided into A, B and C levels a≈←ccording to national standardε₹$®s.
1. Class A lock cylinder, prev≤≠>£ent technical opening ≥ 1✔π©↑ minute, anti-drilling ≥ 10 minutes, anti-saw♦→‍ing ≥ 5 minutes, anti-prying ≥±→λ↔ 10 minutes, anti-pulli✔πng ≥ 10 minutes, anti↕ -impact ≥ 10 minutes.
2. Class B lock cylin÷®der, preventing tech↕≤ ±nical opening ≥ 5 minutes, anti-drilling ≥¥← 15 minutes, anti-sawing ≥ 5 minutes, a¥ nti-prying ≥ 15 minutes, anti-pull÷↔ing ≥ 15 minutes, and anti-impact ≥ 1€₩€5 minutes.
3. Class C lock cylinder, preventing∏• technical opening ≥ 10 minutes, anti∑φ<-drilling ≥ 30 minutes, anti-sawing ≥ 30 minut←↔€es, anti-prying ≥ 30 minut<÷es, anti-pulling ≥ 30 minutes, and anti-im ααpact ≥ 30 minutes.

Classification
Class A: The key is flat o₩₽r crescent, with a row of concave keyway on one←£≥♣ side or both sides o∑→π>r a convex keyway on four sides of the cross×→;
Class B: The key is flat or cr×₽escent, with two rows of concave ke↓λ♠Ωyholes 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 keyw≠₽→ ay on one or both sides, or doublΩ♠e snake keyway inside and outside;

Purchase Standard
The safest lock cylinder has be♣∑∏®en 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 cyl''inder by the number o‌≥  f key teeth. It mainl≥≤ y depends on the structure of th >↔∞e lock cylinder. The blade ♦Ω∏side column structure is often much b>↓★etter than the traditional marbles structure.→•↑☆ When picking a lock, it is b ​"✔etter to ask a professional teac♣βher for advice and then pick it according to♠ ™ the situation.
The second move: pick the lock and weigh two, one≈ε©  than the weight and two to look ↕≠at the lock cylinder. The heavier the ♥ weight, the better the quality of the lock cyl∏≤inder, and the more beads in theλ₩≈ lock cylinder, the better the ↕✘anti-theft function.
The third trick: choose the lock cylinder ®±ε​to see the color, and compare the color ↔✔σ©to see the workmanship. The good∏∑ quality lock cylinder adopt©♥s electroplating treatment, the surface is s"±πmooth and the color is bright. Among them, ←¶™↑the dark yellow color is copper ←¥core, which is relatively strong and has ¶≤♠good anti-theft performance.↓β↕€ The lock core is dim in color and zinc alloy isσ♠® gray and has bubble☆>​s. The anti-theft performance is general.
The fourth trick: The anti-theft perform♦≈'ance of the key is poor when the key is ins ₽λerted into the lock cylinder. After the key Ω•®∏is half inserted, use 5 ✔φ¥γto 7 component force to rotate clo™λ &ckwise or counterclockwise and continu₩∑'σe to press the key into the lock port. Th≥× e stuck key indicates th÷​at the lock cylinder has anti-theft Ω♣performance. Poor, smoothly inserting the ±× ¶lock cylinder in a half-rotation☆§§ state indicates that the anti-∑∞theft effect is good.