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1.The security seals provided by shipping companies used at containers are basically made of steel with high strength, therefore, it is also called high security bolt seal.

2.Bolt seal is a kind of sealing device, once locked, it is closed. If open, it can only be broken. Some old type seals can still restore to the original state, but not for bolt seal. It has high security, so it is called high security bolt seal. It has unique serial number, which is easy for management and tracking.

3.Security seal at containers is a kind of equipment like lock which locks container doors after finish loading goods and correctly closing doors. Once locked, it is unable to open unless by violence. It is unable to repeat use. So during transportation by sea, as long as container door is locked correctly, the seal is complete, and appearance is good, that can prove no one opens it during transportation.