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If you really want to find a good anti-theft lock cylinder, you should take a look at CEI Chang'en invincible colorful lock cylinder, CEI's colorful lock cylinder has passed super B level testing and the European Union's CE certification, anti-drilling time is more than 30 minutes, anti-technical opening time is more than 270 minutes, anti-theft is very good, check it on the Internet and you will know!
This kind of lock recommends that you do not change the lock cylinder yourself, the process is more cumbersome, and the hardware market generally has.
What brand of anti-theft door in your house go to the building materials city to find what brand of store, and then ask the boss for the corresponding model of lock cylinder.
It is recommended that you buy it on Taobao, which is much cheaper than in a physical store. Just pay attention to the specifications of your existing lock when buying, otherwise you can't use it. I've bought good ones online.
Most of the places where security doors are sold have lock cylinders, and of course, there are also places to repair locks.