Package: After purchase, you will receive the following items: 1/2 silver stainless steel door padlocks and 6/12 matching screws. The length of these door chains is adjustable, with a chain length of 19.5 cm, suitable for various door types. The door security chain provides better security, making it a home security solution. Please refer to the picture for the detailed size of the door lock chain. High-quality material: The security chain is made of high-quality stainless steel, which is durable and has a smooth surface. It has excellent resistance to scratches, rust, discoloration, and corrosion. The chain loops are precisely welded and pressed, which is hard and not easy to deform. It will not break or damage even if it is hit or pulled violently. Easy installation: This door security chain is surface-mounted and can be easily installed with a screwdriver or electric drill. After ensuring the door frame is flat, use a Phillips screwdriver or drill bit and screws to firmly install the door lock panel on the door, cabinet, or window. Tighten the screws and you're ready to use it. The operation is simple and quick, with no complicated steps. Enhanced security and privacy: Our security door chain can help you solve the worries of thieves breaking into your home, children staying home alone, and loose door locks. It is designed for entrance doors, allowing you to open the door only partially to identify visitors, and when the door is closed, the chain can be easily unlocked, combining convenience and security. Widely applicable: The door chain lock is compact and beautiful in design, does not take up too much space, and is widely used in various interior and exterior doors. Whether it is an apartment, basement, balcony door or house, bedroom, laundry room, wardrobe, window, drawer, garage, RV, fence door, hotel door, etc., it can be perfectly adapted.