1. The door chain lock is made of quality materials, sturdy, durable and rustproof. 2. If you have any questions, feel to contact us. We will provide help for you at any time and reply to you within 24 hours. 3. The door chain lock provides additional security protection, allowing you to confirm the identity of visitors before fully opening the door and preventing intruders from easily entering your residence. 4. The door chain lock for doors has a smooth operation, ensuring that the security chain will not get stuck or blocked. 5. The surface of the chain lock is smooth and shiny, with a comfortable touch and will not hurt your hand when in use. 6. If you have any problems, feel to contact us. We will provide help for you at any time and contact you within 24 hours. 7. The heavyduty door chain lock is made of sturdy materials and can prevent forced entry. It is an essential function to protect the safety of you and your family. 8. The door chain lock can confirm the identity of visitors before the door is fully opened, enhancing the security of the front door and is equipped with a chain that can be easily released when the door closes. 9. In addition to enhancing security, its chromeplated surface makes it very suitable for indoor use and can match any home design.