The lock cylinder adopts λ≤"≠a number of anti-theft technologies and a vaβ✘♥riety of special-shaped anti-pulling•γ bullets to prevent technical opening. With tγφ"γhe unique structure design of bu¥≤ γllets and blades, it has hi'φgh safety performance of preventing technλ✘•✔ical opening. The lock cont↑δainer is equipped with precis>≈ion number marble and special-shaped ↑✔γ marble structures, whi♥§δch will be automaticall&Ωγy locked when the number marble and s↓>pecial-shaped marble must be$‍∞ pulled at the same time during the technical ope↔ $ning, thus making the technical αφopening fail. The lock cylinder uses a variety o≈→​f special-shaped marbles and m"♣↑™ultiple combinations,​ ✘ which can compile up to ∑♦billions of key numbers, th±♥'✘us realizing zero-opening ±↔βof regions (one in 16 million). The ←>₹lock cylinder is added with♣$$  a side-to-side pressure-type side post §≈∞ locking pin device, which greatly§€ improves the ability to prevent violen←>>≤t torsion.

Anti-theft standard
The security level of a↑‍nti-theft locks is divided into A, B and C leve↑φ ls according to national standards.
1. Class A lock cylinder, prevent techn™​ical opening ≥ 1 minute, anti-drilling ≥ γ 10 minutes, anti-sawing ≥ 5 minutes, anti-p€♥♦rying ≥ 10 minutes, an₩✘↕ti-pulling ≥ 10 minutes, anti-impact ≥ 10 minutes¥β.
2. Class B lock cylinder, preventing <∏technical opening ≥ 5 minutes, a∞Ωα>nti-drilling ≥ 15 minutes, anti-sawing☆ ₩> ≥ 5 minutes, anti-prying ≥ 15 minute‌↕♣>s, anti-pulling ≥ 15 mi≥δnutes, and anti-impact ≥ 15 minutes♠Ω ≠.
3. Class C lock cylinder, preventing techni"↓±cal opening ≥ 10 minutes, anti-drilling ≥ 30 ​β↑♠minutes, anti-sawing ≥ 30 minut→•≈es, anti-prying ≥ 30 minutes, anti-pull ">ing ≥ 30 minutes, and anti-impact'γ" ≥ 30 minutes.

Classification
Class A: The key is flat or crescent, with a rΩσ™λow of concave keyway on¥₩§♣ one side or both sides or a  ₽ convex keyway on four sides of the cross;
Class B: The key is fla€ t or crescent, with two rows&₽✔ of concave keyholes or cylind♦☆₹•rical multi-point concave keyholes on onλε®e or both sides;
Class C: The key is flat, with two row≤¶ s of concave and S-shaped kγ→eyway on one or both sides✔σ, or double snake keyway inside and outside;

Purchase Standard
The safest lock cylinder has been upgraded to Cl→₩σαass B and Class C. It is best to choose Class C↕¥≠δ when purchasing.
The first move: I used to buy a lock t×↑o judge the quality of≈↑π the lock cylinder b δy the number of key teeth. It mainly dep™Ωends on the structure o×↔f the lock cylinder. The blade side column•₹‌∞ structure is often much better than the φπε≈traditional marbles structure. Whe←εn picking a lock, it is better to a¶±✘§sk a professional teacher for advice an '<d then pick it according to the situatiσ ₹on.
The second move: pick t‌‍​λhe lock and weigh two, ★♥ ​one than the weight and two to look at th∏↔e lock cylinder. The heavier t‌♠&he weight, the better the quality of the lo"←•ck cylinder, and the more "'&beads in the lock cylinder, the bett•£ er the anti-theft function.
The third trick: choose the lock c&>ylinder to see the color, and compare t¶±$≈he color to see the workmanship. The good q♦‌≠uality lock cylinder adopts electroplating treat‌€‍ment, the surface is smooth©∑←β and the color is bright. Among them, the dar↔Ω≤☆k yellow color is copper core,✔©‌ which is relatively strong and has good anti-π×→theft performance. The lock ±''core is dim in color and zinc alloy is gray→♥✘ and has bubbles. Th"σ¶×e anti-theft performance is gener§ ε×al.
The fourth trick: The anti-theft performance →±of the key is poor when the key≥☆≥ is inserted into the lock cylinder. After t₹₽™he key is half inserted, use 5 to 7"×" component force to rotate clockwise or counte★₽$rclockwise and continφ××↓ue to press the key into thφ↕∏&e lock port. The stuck key indica§♣±tes that the lock cylinder has anti-theft perfor®×±mance. Poor, smoothly inserting the lock c♠‍ylinder in a half-rotaβ∞¥♠tion state indicates that the anti-thef₹÷t effect is good.