High quality material: The anti-theft turret is made of high quality iron nickel which is durable and has a long service life. Easy Installation: This door safety chain is surface mounted and can be easily installed with just one screwdriver or electric drill. Flexible use: The chain closure can be flexibly adapted to different opening angles and positions. You can choose the appropriate chain locking position according to your requirements to ensure a comfortable user experience. Wide application: Chain locks are commonly used in doors and windows of houses. They can also be used in hotels, private homes, motels, apartments and bedrooms to meet the requirements of different environments. Package: You get 2 sets of anti-theft turrets, and 12 matching screws. The length of these turrets is adjustable, the chain length is 19 cm, suitable for different door types.