Expand:
The moral of "concentric lock" is: lovers will be United forever.
Legend has it that Yue Lao has a treasure concentric lock, and men and women who love each other will never be separated as long as they are locked by the concentric lock! If the lover's love can move Yue Lao, he will give the lover a concentric lock, so that the lover can be together forever.
People who love each other lock their hearts on the lock bridge, hoping to lock their love for life. Concentric lock engraves their names on the lock, locks two hearts tightly on the lock bridge, and hopes their love will never change. Witness their most loyal and sincere love with this concentric lock.