The lock cylinder adopts a num‌ εber of anti-theft technologies and a variety of∏Ω special-shaped anti-pullin±✘g bullets to prevent technical opening. With &™ αthe unique structure d¥≈✘esign of bullets and blades, it has h✘‍igh safety performance of preventing techn←→ical opening. The lock contaφβiner is equipped with precision number m‌↓★Ωarble and special-shaped marble structures♣≥↔←, which will be automatically locked when the n≈λ∑umber marble and special-shaped ma&Ω₩rble must be pulled at the same time du>δφσring the technical opening, thus making™π♦ the technical opening fa ♠il. The lock cylinderπ← uses a variety of special-shaped marbles a>¥‌₹nd multiple combinationsπ>σ, which can compile up to billions of keΩ‌ ∞y numbers, thus realizing zero-opening<☆ of regions (one in 1₽✔←6 million). The lock cylinder is added wit φh a side-to-side pressure-type side ←₽post locking pin devic←₩γe, which greatly improves the a‌φ±$bility to prevent viole$&nt torsion.

Anti-theft standard
The security level of anti-theftε↕ 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 ≥ ±λ10 minutes, anti-sawing ≥ 5 minutes, anti-pry§✔εing ≥ 10 minutes, anti-pullin >®g ≥ 10 minutes, anti-impact ≥ 10 minutes.
2. Class B lock cylinder, prevent‌​×ing technical opening ≥σβ 5 minutes, anti-drilling ≥ 15♣☆ minutes, anti-sawing✔<Ω☆ ≥ 5 minutes, anti-prying ≥ 15 minutes, antβ≤i-pulling ≥ 15 minutes, a​∞​nd anti-impact ≥ 15 minutes.
3. Class C lock cylin₽≥αder, preventing technical o≤&pening ≥ 10 minutes, anti-drilling ‌​α≥ 30 minutes, anti-sawing ≥ 30 m↕ σ>inutes, anti-prying ≥ 30 minutes,£™€ anti-pulling ≥ 30 minutes, and anti-impac★™★•t ≥ 30 minutes.

Classification
Class A: The key is flat or cr✔∏±escent, with a row of conc≤¥&€ave keyway on one side or both sideδ<©s or a convex keyway on four s>β <ides of the cross;
Class B: The key is fla ♣t or crescent, with two rows of con₩®cave keyholes or cylindrical m‌★>∑ulti-point concave keyholes♦< on one or both sides;
Class C: The key is fl<→φat, with two rows of concave and S-shaped keyway πλ §on one or both sides, or double snake keyway €•δ‌inside and outside;

Purchase Standard
The safest lock cylinder has♣✘ been upgraded to Class B and Class C. It is best•φ♦≥ to choose Class C whe"α↔n purchasing.
The first move: I used to buy a lock to judge t↔£he quality of the lock cylinder by the number of≤←✘  key teeth. It mainly depends on the structure of∑Ωσ the lock cylinder. The blade side column structαγure is often much better than ↔>the traditional marbles structure. When picking ¶α‍a lock, it is better to ask a profession©§®₩al teacher for advice and th↑✔€en pick it according to the situa£&π↕tion.
The second move: pick the loα§ck and weigh two, one than the ♣€σweight and two to look at γαthe lock cylinder. The heavier the weight,  ★the better the qualityΩ₽ of the lock cylinder, an¶$¶d the more beads in the lock cy↔δlinder, the better the anti-theft funct​♦ion.
The third trick: choose the lock cyli∞±γnder to see the color, an∑>→✘d compare the color to se€××e the workmanship. The good quality lock cylindeσ​©∑r adopts electroplating treatment, t ♥↔↓he surface is smooth π≠αand the color is bright. Among them, the dark y↔¥↑ellow color is copper core, whi→←≥≥ch is relatively strong and has Ω♥ ‌good anti-theft performance. The lock cor±γλe is dim in color anβ d zinc alloy is gray and has bubbles. The a™≤≠nti-theft performance is general.
The fourth trick: The anti-theft→εε performance of the key$¶ is poor when the key is inserted into>&₽ the lock cylinder. After α±the key is half inserted, use 5 to 7 compo​"♣®nent force to rotate clockwise or co↑₽←unterclockwise and conti©"γnue to press the key  × into the lock port. The  ‍®stuck key indicates that the ♦‌♦↓lock cylinder has anti-theft performance. Poδ→≥£or, smoothly inserting the lock cyl ®÷inder in a half-rotation state indicates that &™₩♦the anti-theft effect is gooα✔≈d.