Shear locks are strong locking devices since they combine mechanical and electromagnetic locking mechanisms. It is suitable for applications which require a high level of entry control. Shear locks can be fitted to double action doors with 180° opening angle and is suitable for any type of door and frame construction but avoid the use in single doors in path of egress where the failure of the lock could result in the inability of people to exit in a fire. Optional brackets are available for all types of installations including surface mount, double acting doors, gates, Although shear locks are very reliable, caution should be taken in their application to ensure that a secondary method of releasing the door is always available, usually in the form of a pushbutton marked “Push to Exit” in language acceptable to the local fire authority.