electric bolt lock consists of two main parts: the lock body and the lock hole. The key component in the lock body is the ?lock tongue?, which cooperates with the ?lock hole? to realize the two states of ?close the door? and ?open the door?. That is, the locking tongue is inserted into the locking hole to close the door, and the locking tongue is separated from the locking hole to open the door. Because of the retractable function of the bolt, it was named the ?electric bolt?.