【Secure and Durable】: Made of durable solid brass, the double cylinder lock is durable, corrosion-resistant, and not easy to rust and deform, which is equipped with a security pin inside for enhanced security. Measures 65 mm (32.5/32.5) / 2.56 \" in length; 32 mm / 1.26 \" in height; 9 mm / 0.35 \" in thickness; 16 mm / 0.63 \" in diameter. 【Wide Application】: With a longer lifespan, the brass cylinder lock is self-lubricating, making the door easy to open, which is suitable for wooden doors, aluminum doors, storm doors, and sliding patio doors, widely used in homes, offices, warehouses, garages, balconies, and other places. 【Easy Installation】: The storm door lock cylinder is easy to install, just remove the old lock cylinder, insert the new brass cylinder, and fix it with screws to complete the installation. 【Meet Your Needs】: Comes with 8 keys (6 master keys + 2 construction keys) for convenient and flexible management. Suitable for residential and commercial applications requiring reliable security. 【Usage Tips】: Please confirm the size before purchase. Construction keys are used during construction and become invalid after the renovation is completed.