SOLID AND STABLE: The security door chain lock is made of high quality stainless steel material, sturdy, durable and rustproof. Besides, the thickened and widened chain and casing make this door lock very solid. PROTECTIVE SECURITY: You can unlock the door chain lock from the inside while it cannot be unlocked from the outside, making you feel much safer in your home. Plus, you can identify a caller before the door is fully released. SMOOTH FINISH: The surface of the stainless steel door chain lock is smooth and shiny, it is not easy to get scratches or lose color. Meanwhile, it is comfortable to touch the door chain as it will not hurt the hand during use. PRACTICAL DESIGN: If you want to keep children, pets or the like away, this interior door chain will work just fine. Sometimes you can even leave the door on the chain when it's very hot and let the house cool down and ventilate overnight. WIDE SCOPE OF APPLICATION: With the 6pcs matching screws, the door chain latch can be easily mounted on a variety of wooden door frames. It can be widely installed on residential, hotel and apartment doors. Features: Material: Stainless Steel Colour: Silver For details of the specific sizes, please refer to the above images. Package Includes: 1 x Door Chain Latch6 x Screw Note: Please read the ruler carefully before purchasing. Please allow 0-1cm error due to manual measurement.