Shearlock magnets are magnets that are used to lock and unlock doors. They are typically used in combination with an electronic access control system and are installed on the door jamb or door side. Shearlock magnets work by using a magnetic field generated by a magnetic rod or core installed in the magnetic system. When the door is closed, the magnetic field is activated and the door is locked. When a user wants to gain access, they must enter an access code on a code keyboard or use a card to deactivate the magnetic field and unlock the door. Shearlock magnets are a popular option for access control because they are easy to install and provide high security. However, they may also have limitations such as being dependent on electricity to work and being vulnerable to power outages or other technical problems. Additionally, they may be noticeable and may affect the appearance of a door. It is important to remember that "shearlock" is a brand name and that there are other brands that offer access control magnets that work in a similar way.