The lock cylinder adopts a number of anti-thefσ¥✘₩t technologies and a variety of spוβecial-shaped anti-pulling bullets to prevent ∑∞technical opening. With th ≠✘e unique structure design of b±> ullets and blades, it has high safet$απy performance of preventing technical openin'€g. The lock container is equipped w¥♥ith precision number marble and ♣​≠☆special-shaped marbl&₽Ωγe structures, which will•→∑ be automatically locked when theλ§ number marble and special-sh•✔↓₹aped marble must be pulled at the same tiλ>£✔me during the technical opening, th≈☆©♣us making the technical opening fai₹≥l. The lock cylinder u♥↓•ses a variety of special-shaped marbles and δ'♠multiple combinations, which can comp©"λ₹ile up to billions of key numbers, thus reali$> zing zero-opening of regions (✔→Ωone in 16 million). The lock cylinder is≠≠δε added with a side-to-side pressure-type sφα★♦ide post locking pin devic€>♥₽e, which greatly improves th↔קαe ability to prevent viα€$βolent torsion.

Anti-theft standard
The security level of§δ anti-theft locks is divided π" into A, B and C levels acco'≠rding to national standards.
1. Class A lock cylinder, preβ•₹vent technical opening★   ≥ 1 minute, anti-drilling ≥ 10 minu₹λ"±tes, anti-sawing ≥ 5 minutes, antiβπ-prying ≥ 10 minutes, anti-pulling ≥ 10 minutes,γ∏ε₩ anti-impact ≥ 10 minutes.↓₹ 
2. Class B lock cylind​↑er, preventing technical ope§€✘ning ≥ 5 minutes, anti-drilling ≥ 1®☆5 minutes, anti-sawing ≥  ₽γ5 minutes, anti-prying ≥ 15 minutes, a©¥↔★nti-pulling ≥ 15 minutes, and an§₽♦✔ti-impact ≥ 15 minutesσ&.
3. Class C lock cylinder, preventing§π technical opening ≥ 10 minutes, anti-drilliλσ‍ng ≥ 30 minutes, anti-sawing ≥ 30 minutes, aπ₹ •nti-prying ≥ 30 minutes, anti-pulling ≥ 30 &∞™βminutes, and anti-impact ≥ 30 minute ∑≠s.

Classification
Class A: The key is ✔‌★flat or crescent, with a row of concave k©​♠σeyway on one side or both sides or≤₩ a convex keyway on fo✘δ¶ur sides of the cross;
Class B: The key is fl ​at or crescent, with two rows of concave keyho♥δ♠ les or cylindrical multi-poin×πσt concave keyholes on one or both sides;
Class C: The key is flat, with two↔‍'≥ rows of concave and S-shaped keyway on one "πor both sides, or double ‍∑snake keyway inside and outside;

Purchase Standard
The safest lock cylinder has been up♣§→graded to Class B and♣& Class C. It is best to chooseα≤ Class C when purchasing.
The first move: I used to buy a lock to judge ∑™§♦the quality of the locγ≥≠"k cylinder by the number o∑πf key teeth. It mainly depends on ∞∏>the structure of the lock cylinder. The blade s↕€×✔ide column structure is often much betterγ  than the traditional m•♠≠←arbles structure. When p↕↑↔icking a lock, it is better to ask a profess↓∑φional teacher for advice and then pick it accord ✔♣ing to the situation.
The second move: pick the lock and weigh two, o♣✔✔πne than the weight and two to look at the₹→ lock cylinder. The heavier the weight, the bette£₹r the quality of the©  lock cylinder, and the more Ω♣₹®beads in the lock cylinder, the δ→better the anti-theft function.
The third trick: choose the lΩ​ock cylinder to see the color, and compare the co¥♥←γlor to see the workmanship. Th∑​"πe good quality lock cyl•σinder adopts electroplating treatment, the s♦∞urface is smooth and♥÷ the color is bright. Among them, the dark yeσ>©llow color is copper core≥§, which is relatively→↔• strong and has good anti-theft pe♥ ‌rformance. The lock core is dim in color‌$ and zinc alloy is gray and has bubbles. Tλ™<he anti-theft performa ↕nce is general.
The fourth trick: The anti-theft performance o§☆f the key is poor when the ke₹ ≤y is inserted into the lock cylinder. A✘∑fter the key is half insπ∞∏erted, use 5 to 7 component force to rotate‍§∞§ clockwise or counterc‌"<lockwise and continue to press thπαφεe key into the lock p≥↔←ort. The stuck key indicates that the lock cyliλ↓​nder has anti-theft performance. Poor, smooth↑≈ly inserting the lock cyliβ÷↕nder in a half-rotation state indic∑&Ωφates that the anti-theft effe•'ct is good.