Door holder magnets are magnets used to hold doors in an open position. They are commonly used on doors that are frequently used, such as interior office doors or doors in public buildings, to prevent the door from accidentally closing and blocking access.

Door holder magnets work through a magnetic field generated by a magnetic rod or core installed in the magnet system. When the door is opened, the magnetic field is activated and holds the door in an open position. When the door is closed, the magnetic field is deactivated and the door is locked.

Door holder magnets are a convenient option for security because they are easy to install and make it easy to keep doors open. However, they may also have limitations, such as being dependent on electricity to work and being vulnerable to power outages or other technical problems. In addition, they may be noticeable and can affect the appearance of a door.