The lock cylinder adopts a number of ant©₽σλi-theft technologies and a variet×∏↔y of special-shaped anti-pulling bu≈↓llets to prevent tech∏±nical opening. With the$β unique structure design of bu±₹llets and blades, it has high safety↕β performance of preventing t♣₩≈echnical opening. The lock container is eqδ ε©uipped with precision number marble and special☆÷-shaped marble structures, which will be '​∑automatically locked when the number mar‌&£ble and special-shaped £₹₩★marble must be pulled at t✔₩☆€he same time during the$  technical opening, thus making the technical¥& opening fail. The lock cylinde₽∑βr uses a variety of special-shaped marbles ♥®>and multiple combinations, which can compi♣<le up to billions of key numbe∑£φΩrs, thus realizing zero-opening of regions (on ≥e in 16 million). The lock cylinder ≤☆♣is added with a side-to-side p€♠♦♥ressure-type side post locking pin dλ↓evice, which greatly improves the abil ↔φity to prevent violent torsion.

Anti-theft standard
The security level of anti-thefλ$t locks is divided into A, B and C leve¥≈™ls according to national s✘<¥tandards.
1. Class A lock cylinder, prevent teε chnical opening ≥ 1 minute, anti♣>σ-drilling ≥ 10 minutes, anti-sawing ≥ 5 α ₽↑minutes, anti-prying ≥ 10 minutes,★★& anti-pulling ≥ 10 minutes, anti↑↕-impact ≥ 10 minutes.
2. Class B lock cylinder, preventing technical opΩδ ening ≥ 5 minutes, anti-drilling $£✘ ≥ 15 minutes, anti-sawing ≥ 5 minutes, anti-pr ‍₽ying ≥ 15 minutes, an↓✘λ§ti-pulling ≥ 15 minuteγ♠♥s, and anti-impact ≥ 15σ±₩ minutes.
3. Class C lock cylinder, preventing technica★©‌l opening ≥ 10 minutes, anti-drilling &₹≥ 30 minutes, anti-sawing ≥ 30 minutes, anti-×←εprying ≥ 30 minutes, anti-pulling ≥ 30 mi∏₹¶nutes, 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 keyway λδ₹€on four sides of the cross;
Class B: The key is flat or cr✔₩‌escent, with two rows of concave key§•holes or cylindrical multi-pδ×​oint concave keyholes on one or ‍←both sides;
Class C: The key is flat, with two rows o₹εf concave and S-shaped keyway o$"↑n one or both sides, or double snake keyway ♠ ​↓inside and outside;

Purchase Standard
The safest lock cylinder has been upgraded to C∞λlass B and Class C. It is bes" § t to choose Class C wh₹≈en purchasing.
The first move: I used t←×♣↑o buy a lock to judge the quality ♦≤of the lock cylinder by the numb €er of key teeth. It mainly λ×Ωdepends on the structure of the"γ lock cylinder. The blade side c€∏ olumn structure is oftenΩ​ much better than the traditiλ₽↔onal marbles structure. W☆±¶∑hen picking a lock, it is be≥ΩΩ✘tter to ask a professional teacher for advγ≥ice and then pick it ac®© cording to the situat"​φion.
The second move: pick the lock and weig&δh two, one than the weight and two tσ←∏☆o look at the lock cylinder. The heavier the wei≠×≠✔ght, the better the quality of the¥₽★® lock cylinder, and the more beads in the"↕ lock cylinder, the better th§ Ωe anti-theft function.
The third trick: choose the l↑ε≤®ock cylinder to see the color♠↕, and compare the color ¶±→to see the workmanship. The good quali¶¶¥☆ty lock cylinder adopts electrop≥₽σ↕lating treatment, the surface is smooth and th¥÷¥e color is bright. Am↑↕σβong them, the dark yellow colo₽‍≠r is copper core, which is™>→" relatively strong and has good anti-the♦'≤ ft performance. The lock core is dim in color ®£α₽and zinc alloy is gray and has bu∏ πbbles. The anti-theft performance isπ☆σ general.
The fourth trick: The anti-theft performanc♠↑♠↑e of the key is poor when the key isε" inserted into the lock cylinder. After the ∏÷‍∞key is half inserted, use 5 to 7 coδα¥↓mponent force to rotate clockwise or counterclocβ✘♦¶kwise and continue to press the key iσ§✔nto the lock port. The stuck key indicates ‍∏that the lock cylinder has anti-theft ‌∞'☆performance. Poor, smoothly inδ♦εserting the lock cylinder in a halfΩ"-rotation state indicate↑§s that the anti-theft effect is good.