According to the different principles of the lock core, anti-theft door locks can be divided into pin locks, blade locks, magnetic locks, IC card locks, fingerprint locks, and so on.
　
marble locks and magnetic locks are more common. Flat locks, cross locks, computer locks, etc. are all tumbler locks; magnetic locks were more popular in the past few years, but they are relatively rare in the past two years.
　
If the key bar is bare and without teeth, with three or four small dots inlaid on it, such a lock is a magnetic lock. The industry believes that magnetic locks are not reliable, and the opening of cross locks is very convenient. Special tools for opening magnetic locks and cross locks are now available on the market. With this tool, a thief can open most of the magnetic locks and cross locks within a minute or two.　

Install anti-theft door locks and pay attention to safety issues

According to the principle of the lock cylinder, anti-theft door locks can be divided into pin locks, leaf locks, magnetic locks, IC card locks, fingerprint locks, etc.　

Marble locks and magnetic locks are more common. Flat locks, cross locks, computer locks, etc. are all tumbler locks; magnetic locks were more popular in the past few years, but they are relatively rare in the past two years.　

　　 If the key bar is bare and without teeth, with three or four small dots inlaid on it, such a lock is a magnetic lock. The industry believes that magnetic locks are not reliable, and the opening of cross locks is very convenient. Special tools for opening magnetic locks and cross locks are now available on the market. With this tool, a thief can open most of the magnetic locks and cross locks within a minute or two.　

　　Computer lock compound type lock is more reliable

　　Computer lock is just a professional term, it is not really used to unlock the lock with a computer. There are three to five circular grooves on the computer lock key-it is said that these grooves are arranged and combined by the manufacturer using computers, so they are called computer locks.

　　Different manufacturers, most of the computer programs used are not the same, the location, size, and depth of the grooves are naturally different, so its mutual opening rate is much lower than that of cross locks and flat locks. Even a master unlocker, it takes about ten minutes to open a computer lock.　

　　 There is also a kind of anti-theft door lock that is more reliable, and that is the composite lock. The so-called composite lock refers to the combination of two or more lock cylinders with different principles on the same lock.　

　　 The most common composite lock on the market is a combination of a pin lock and a magnetic lock. Professionals call it a magnetic composite lock. To open this kind of lock, you must first destroy the magnetism of the lock before it can be unlocked technically.