The lock cylinder adopαπts a number of anti-theft technologies and&∑≤ a variety of special✔ ∑-shaped anti-pulling bullets to prevent tech¶δ↑✔nical opening. With the unique structure design σ&of bullets and blades,®≥ it has high safety performance₹σ®φ of preventing technical opening. The lock con↔•₩βtainer is equipped with precision number mar®®↕£ble and special-shaped marble structures, which  £β$will be automatically locked whe ♣‌n the number marble and special-shaped ma∑₹÷•rble must be pulled at the same time duringαε£↕ the technical openin♦¥g, thus making the technical opening fail. The  <lock cylinder uses a variety of special-sβ haped marbles and multiple comb<♦inations, which can c←↑☆ompile up to billions of key numbe×φ¥€rs, thus realizing zero-opening of r±♥egions (one in 16 million). The lock >¶€cylinder is added with a side-to-side pre≤×♥♠ssure-type side post locking pin devi&€♦ce, which greatly improvλ←es the ability to prevent vioβδlent torsion.

Anti-theft standard
The security level of anti-theft loc∑β↕ks is divided into A, B and C levels acco¥™rding to national standards.
1. Class A lock cylinder, prevα​ent technical opening §↓♦✘≥ 1 minute, anti-drilling ≥ 10 minut≤¥•es, anti-sawing ≥ 5 minutes, antφ↓₽i-prying ≥ 10 minutes, anti-pulling ≥ 10 minu∑​tes, anti-impact ≥ 10 min♣β‌utes.
2. Class B lock cylinder, pre✘↔venting technical opening ≥ 5 minutes, ×≥anti-drilling ≥ 15 minutes, anti-sa<'εwing ≥ 5 minutes, anti-prying ≥ 15 minute®& s, anti-pulling ≥ 15 minutes, and an ±ti-impact ≥ 15 minutes.
3. Class C lock cylinder, preventing tech"∑×'nical opening ≥ 10 minutes, anti-drilli₽£δ∑ng ≥ 30 minutes, anti-sawing ≥ 30 mφα§inutes, anti-prying ≥ 30 minutes, anti-pulling ≥€ ₹λ 30 minutes, and anti-impact ≥ 30 mγ'±δinutes.

Classification
Class A: The key is f£•✘←lat or crescent, with a row of co×Ωncave keyway on one side or both siβ&§des or a convex keyw¶≤₩ay on four sides of the cross®÷;
Class B: The key is flat or crescent, with two roβα&ws of concave keyholes or  ¥cylindrical multi-point concave keyholes ™₹♠©on one or both sides;
Class C: The key is flat, with two rows of conca≠↕λve and S-shaped keywayαγ≈ on one or both sides, or dεαouble snake keyway inside and outside;

Purchase Standard
The safest lock cylinder has been upgraded to C★"γ‌lass B and Class C. It is best to£¥₹ choose Class C when purchas✔  ing.
The first move: I used to buy a lock to j↔↑λudge the quality of the lock cylinde>&♥≤r by the number of key teeth. It mainly depends ≠↑✘☆on the structure of the lo><♥ck cylinder. The blade side column struΩ€cture is often much better than   Ω‌the traditional marbl"€¶™es structure. When pick&&ing a lock, it is better to ask a profess♠↔ional teacher for advice and theγ₩≥↓n pick it according to the situation.
The second move: pick theγβ∏ lock and weigh two, one than the weight an® φd two to look at the lock cylinder. The he ☆avier the weight, the b$γλetter the quality of th<<e lock cylinder, and the mo§•re beads in the lock cylinder, the better the ♥σαanti-theft function.
The third trick: choose the lock cylin±€→∑der to see the color, and comp π•are the color to see the workmanship. The good quγδality lock cylinder adopts el±↓δectroplating treatment, the surface ¶£≈is smooth and the color is brig←∑∞ht. Among them, the dark y>☆ellow color is copper core, which is ↔'relatively strong and has good anti-thef××t performance. The lΩ‍ock core is dim in colo±∑©r and zinc alloy is gray and has bub♣↔bles. The anti-theft per'φ ®formance is general.
The fourth trick: The ∑§☆anti-theft performance of th↕↓e key is poor when the key is i÷‌'×nserted into the lock cylinder. After the key i ‍<s half inserted, use 5 to÷↕Ω© 7 component force to rotat₹← e clockwise or counterclockwise aα¥nd continue to press the key iα£πnto the lock port. The stuck☆απα key indicates that the lock cylinder hαδ∞as anti-theft performance. Poor, smoot©∑®•hly inserting the lock cylinder in a half-rotaφ>tion state indicates that the anti-theft >§effect is good.