Internal operate Only: Installed on vertical tracks, the deadlock can only be operated from inside, serving as an additional security layer against unauthorized access General Compatibility: Before purchase, verify dimensions to secure with your garage door; our responsive team secure prompt assistance within 24 hours for any inquiries Easy Installation: Features simple setup with 4 Auto tapping screws, Suitable for most garage doors and can be mounted on either left or right side for flexible placement Premium Component: Constructed with SPCC Steel and blue plating for enhanced durability and rust resistance, ensuring long lasting in various conditions Enhanced Security: This heavy duty garage side provides extra Protect during night, vacations, or anti theft situations, offering peace with its robust design, Manufacturer: LUJIAXI