1. The door chain lock is made of quality material, sturdy, durable, and rustproof. 2. If you have any questions, please feel to contact us. We will assist you at any time and respond within 24 hours. 3. Chain lock for door. The chain operates smoothly, ensuring the safety chain does not get stuck or jammed. 4. This security door chain lock is chromeplated, making it resistant to corrosion and wear. 5. With adjustable length, these front door chains fit various doors. 6. Our security door chains feature a compact design, taking up minimal space on your door, ideal for those with limited room. 7. The heavyduty door lock chain is crafted from solid material, providing protection against forced entry—an essential feature for safeguarding your family. 8. The door chain allows you to identify visitors before fully opening the door, enhancing frontdoor security. It also includes an easyrelease mechanism when the door is closed. 9. Beyond added security, its chrome finish suits indoor use and complements any home dcor.