The lock cylinder adopts a number λ©of anti-theft technologies ± ‌and a variety of speci✘¶al-shaped anti-pulling bullets to pre>‍ vent technical opening. With the unique§∞♣ structure design of bullets and bl∑₩ades, it has high safety per​¥×formance of preventing technical  ☆•opening. The lock container is>≤ equipped with precision ✘Ω§number marble and special-sγ✔♥haped marble structures, which will be→φ automatically locked when the number marble and​ε special-shaped marble must be pulled at¶δ the same time durinγ±↕£g the technical opening, thus making♠'←♠ the technical opening fail. The lock cylinder u"↔ses a variety of special-ε≥shaped marbles and multiple combinatiγ$ons, which can compile up to billions of key ‍→☆numbers, thus realizing zero-openingσ£× of regions (one in 16 millio®αn). The lock cylinder is added with •&a side-to-side pressu≥↔✘re-type side post locking pin device, whi∏∏ch greatly improves the abilit↑•γy to prevent violent∏'© torsion.

Anti-theft standard
The security level of anti-thefλ∏≈t locks is divided into A, B and C levels acco∑÷λ≤rding to national standards.
1. Class A lock cylinder, prevent tec•εhnical opening ≥ 1 minut≥₹€♥e, anti-drilling ≥ 10 γ​∏minutes, anti-sawing ≥ 5™÷¶  minutes, anti-prying★δ© ≥ 10 minutes, anti-pulling ≥ 1€<®∑0 minutes, anti-impact ≥ 10 minutes.
2. Class B lock cylinder, pr≠σ↓eventing technical opening ≥ 5 m∞∑→inutes, anti-drilling ≥ 15 minut₩φ es, anti-sawing ≥ 5 minutes,✔¥$¥ anti-prying ≥ 15 minut←​<es, anti-pulling ≥ 15↕>‌ minutes, and anti-impact ≥ 15 minutes.
3. Class C lock cylinder, preventin÷↓®g technical opening ≥ 10 minuα§tes, anti-drilling ≥ 30 minutes, anti-± £sawing ≥ 30 minutes, anti-pryi¶∑ng ≥ 30 minutes, anti-pulling ≥ 30 mε​inutes, and anti-impact ≥ 30 minutes.©✘

Classification
Class A: The key is flat or crescent, ♦✔≤with a row of concave keyway "♠₹on one side or both sides or a convex÷φ keyway on four sides of the cross;
Class B: The key is flat ×'¥★or crescent, with two rows of concave ke•™≈¶yholes or cylindrical ✘‌multi-point concave keyholes on one δ₽or both sides;
Class C: The key is flat§™α‌, with two rows of concave and S←₹'$-shaped keyway on one oσαr both sides, or dou↑♠∞ble snake keyway inside and outside;

Purchase Standard
The safest lock cyli÷πnder has been upgrade&♥d to Class B and Class C. It is best to c$>&hoose Class C when purchasing↓←​☆.
The first move: I used to buy a lock to juφ♥¶dge the quality of the≥↕™ lock cylinder by the number of ke€♦®♥y teeth. It mainly depends £π∏on the structure of the lock cyl✔π>inder. The blade side column structure is of'✘<ten much better than the traditional mar &←bles structure. When picking ↓♥≈a lock, it is better to ask a prof∏♣essional teacher for advice and the< ♥₽n pick it according to ®♦€>the situation.
The second move: pick the​  lock and weigh two, one than the©λ§' weight and two to look at the lock cylinder. The↓δφ heavier the weight, the better™™ the quality of the lock cylinder, and the ​€ε more beads in the lock★λ≤ cylinder, the better the a∞€‌≥nti-theft function.
The third trick: choose the l≈≈ock cylinder to see the c→>↕olor, and compare the color t‍≈σo see the workmanship. The good quality lock c "ylinder adopts electroplating treatment, the su≈&£$rface is smooth and the c→φolor is bright. Among them, €÷$↕the dark yellow color is copper core, which is re→‌latively strong and has good anti-theft pαβ≈εerformance. The lock core is dim in color and‍α₹ zinc alloy is gray and has bubble​₩s. The anti-theft performance is general.
The fourth trick: The anti↑ -theft performance of the keyδλ is poor when the key is inserted into the♦ ♣σ lock cylinder. After the key is half inserte∏♣€<d, use 5 to 7 componen≈←÷≥t force to rotate clockwise or counterclo×σ↔"ckwise and continue to≠↔≠ press the key into the lock por∞™★♥t. The stuck key indicates that the lock cy↓↔×✔linder has anti-theft performance. Poo¥☆£↓r, smoothly inserting the lock cy>βλ×linder in a half-rotation state indicates th♠>♠at the anti-theft effec¥¶‍t is good.