Check the security level of locks: When purchasing, be sure to show the security level certificate of the lock used by the security door to see if it is a special security lock qualified by the public security department. Select the security door according to the level of the lock.
Check the anti-theft door locks: there should be steel plates with a thickness of 3mm or more at the locks for protection.
Check the length of the main lock of the anti-theft door: The effective length of the main tongue of the anti-theft door should not be less than 16mm, and there should be a locking device for the tongue. If it does not, it is unqualified.