Enhanced Security: The serrated bolt design adds an extra layer of security, hindering potential break-in attempts. Concealed stainless steel security lock for French doors. Mortise bolt. Quick and Easy Installation: Designed for double doors with top and bottom latches, this mortise bolt allows for quick and easy installation. Fast Installation: The top and bottom latch for double doors makes installation quick and easy, saving time and effort. French door latch. Concealed door latch. Enhanced Security: The serrated bolt design significantly increases the security of your doors, preventing unauthorized access. Top lock for French doors. Hardware for double French doors. Secure Mortise and Tenon Assembly: The mortise and tenon construction ensures a secure fit, maintaining the stability and security of your doors and windows. Mortise door bolt. Stainless steel door latch.