This European standard applies to cylinders for such locks as are normally used in buildings and are designed to be used with cylinders. It identifies one category of use grade, three grades of durability, three grades of fire resistance, four grades of corrosion and temperature resistance, six grades of key security, and five grades of attack resistance.

Keying systems are available in various degrees of complexity depending on the number of keying levels used. Change keys form the lowest level of the hierarchy of a key system. Master, grand master and great grand master keys form the higher levels of hierarchy of key systems. Level one systems cons

What is master key?
A master key is a key which will open all the locks in a set, even though each lock has its own different key.

European profile lock cylinders are the most popular type in the market. They usually have same shape but different in materials, sizes, brands especially the types of keys and locking mechanisms. The cylinder provides security functions such as anti-prying, anti-drilling, anti-shatter and anti-replication.

The lock cylinder is the main part that controls the unlocking of the lock, and is an important part of the lock. The lock core and the key can rotate and drive the core of the lock bolt. The following explains the operation of the unlocking core with the European-style lock cylinder as the main explanation.

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