General description Made of stainless steel, this anti-theft chain door lock is durable and comes with screws for easy installation. It is suitable for families, hotels, apartments, etc., to increase security, prevent theft, and provide peace of mind. Additionally, it can be used to prevent children and pets from leaving the house without permission. Technical specifications Material: Stainless steel Usage Press the button behind the door to remove the chain. Cannot be unlocked from the outside.