The external opening handwheel manufacturer tells you that the safest lock cylinder has been upgraded to B and C grades. It is best to choose C grade when purchasing.

The first trick: Before buying a lock, you can judge the quality of the lock cylinder by looking at the number of key teeth. The external opening handwheel manufacturer tells you that it mainly depends on the structure of the lock cylinder. The blade side column structure is often much better than the traditional marble structure. The opening handwheel manufacturer tells you that when picking the lock, it is best to find a professional teacher and then pick it according to the situation.
The second measure: external opening handwheel manufacturers tell you to choose the lock and weigh two by the catty, one is to compare the weight and the other is to look at the lock cylinder. The external opening handwheel manufacturer tells you that the heavier the weight, the better the quality of the lock cylinder, and the more beads in the lock cylinder, the better the anti-theft function.
The third measure: choose the lock core to see the color, and compare the color to the workmanship. The lock core of good quality is electroplated, with smooth surface and bright color. The external opening handwheel manufacturer tells you that the dark yellow color is a copper core, which is relatively strong and has better anti-theft performance. The lock core is dim in color, and the color gray and white with bubbles is zinc alloy.
The fourth measure: The external opening handwheel manufacturer tells you that the key is inserted into the lock core and the anti-theft performance is poor. After the key is half inserted, use 5 to 7 minutes of force to rotate clockwise or counterclockwise and continue to press the key into the lock opening. The key indicated that the lock core has poor anti-theft performance, and the smoothly inserted into the lock core in the semi-rotating state indicates that the anti-theft effect is good.