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Nowadays, many people buy it online and then go home and pack it themselves. The key is to find an anti-theft lock cylinder with good anti-theft performance, it is recommended that you take a look at CEI's invincible colorful lock cylinder, CEI's colorful lock cylinder has passed the super B level test and the European Union's CE certification! The anti-drilling time is over 30 minutes, and the anti-technical opening is over 270 minutes, and the anti-theft performance is very good, so you will know it at once!
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Most of the places where security doors are sold have lock cylinders, and of course, there are also places to repair locks.
Where hardware is sold, there are lock cylinders that are sold.
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.
It depends on which type of double lock cylinder it is.