【2 in 1 Door Locks with Anti-Theft Chain】One lock = one slide lock + one chain lock. The door chain lock is equipped with a spring-loaded button lock which can improve anti-theft performance and ensures safe viewing and ventilation when the door is partially opened, providing extra security for your home and office doors. extra security and privacy for your bedrooms, bathrooms, toilets, as double protection against unwanted entry. The barrel bolt door lock chain can also be installed in windows, cabinets, backyards, kennels, fences, porch, closet door, outdoor shed, laundry room, chicken coop. It can also improve child safety at home, avoid your children or kids opening drawers or cabinet doors. 【Sturdy and Durable】Only source the highest quality components. The heavy duty chain door guard with lock is made of high quality stainless steel for rust resistance, uses the latest electroplating and polishing technology to increase the service life. Surface slide lock with brushed nickel