1. Front door security locks serve as chain locks for front doors, providing the added advantage of a door locking mechanism. The front door can be completely unlocked from the outside using a key. 2. Door chains are frequently used on front doors as they allow identification of visitors before fully opening the door. Anti theft door chains offer enhanced protection against intruders and are more resistant to damage if the door is forced open. 3. Door lock chains are surface mounted, enabling easy installation with just a screwdriver or drill. Front door locks are universal and can fit doors of any size. 4. The smooth operation of the front door chain lock prevents unnecessary snagging or jamming of the safety chain. The interior mechanism of the door lock is designed to avoid concerns about forced entry. These locks enhance safety with additional door security features.