Second, the lock core people generally buy locks only look at the shape, feel great, it must be good. As long as you pay attention, no matter which kind of domestic lock you buy, the lock core is generally copper. The characteristics of copper are soft. With electric drill and concentrated acid, you can easily destroy the copper lock core. There are also differences in the types of lock cylinders. At present, the lock cylinders that are commonly used are European-style lock cylinders. In addition, there are American-style thread lock cylinders and fire lock lock cylinders. The latter two are relatively safe, and American lock cylinders are used in high-end gears. The door lock has good quality and high safety. The fireproof lock cylinder is applied to the fire door lock and can withstand the high temperature of 975 degrees for 90 minutes. It is a special door lock cylinder that is enforced by the state.
Third, there are many keys to the key lock, cross, round, crescent, a lot of various colors, many keys are made of copper or aluminum-iron alloy, it is easy to be copied, the current better materials are steel, there are new The electronic key is safer.
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