Invisible doors because of their fashionable appearance and no locks can be seen from the outside, so many families now widely use invisible doors. But if the invisible door is used in the bedroom or bathroom, and privacy needs to be protected, then the invisible door lock body needs to be installed. In order for the invisible door to play an invisible effect, the lock body must be a single-sided lock body. There is a lock inside the door to ensure privacy. The appearance of the invisible door does not change at all on the outside, but the lock body is added to protect it. The role of privacy.