EXPERIMENTAL PROOF:door locks are upgraded through technology and materials.Definitely the ty you have been looking for,After many tests and practice, The door latch lock is 5 times than the ordinary door latch lock. bing you not only ty but also comfort DURABLES: barrel bolt made with heavy duty steel ,the solid door latch has been tested more than 500,000 times operation. latch lock used latest electroplating and polishing technology to ensure a perfect long lasting. material which improves corrosion proof, enhance wear proof and hardness, protects the metal surface and have a good insulation performance 5 MINUTES TO INSTALL: door latch lock is upgraded for better material and durability. The door latch is mounted on the door e with an electric screwdriver and drill bit to complete the DIY barrel lock installation for less than 5 minutes Widely Used:door chain lock is a commonly used classic style. Chain door lock can be used in many places, such as apartment doors, hotel doors, office doors, bedroom doors, storeroom doors, basement doors, garage doors, cabinet doors, windows, etc Widely used device for providing safety and privacy, mainly used for bedroom doors, closets, bathrooms, dog houses, lofts, chicken coops, and barn doors. Installing a sliding latch lock on your