Anti-theft protectionThe anti-theft door chain provides additional protection based on door locks and latches, which can effectively prevent the intrusion of thieves and strangers, which is very suitable for people living alone. It can also prevent unauthorized children from leaving the house, providing extra protection for children's safety. Durable and Good Loading CapacityHigh quality stainless steel ensures the chains can be used for a long time . Thicker chain with good load-bearing capacity can withstand external impact. Smooth surfaceThe surface of the chain lock is smooth and shiny, it is not easy to scratch or lose color . Meanwhile, it is comfortable to touch the door chain because it will not hurt your hand during use. With screws and stable installation 4 sets of door chains come with 16 screws that you can install directly with a screwdriver and they will not fall off after installation. (Please refer to the picture for detailed size) Scope of application The door chain is used for inward opening doors, wooden doors, metal doors and devices anti-theft. It can be used on hotel, apartment, house and bedroom doors.