Enhanced Chain Construction: Each ring of the chain is welded to prevent it from breaking, thereby increasing safety and durability Premium Stainless Steel Material: The product is made of thick stainless steel plate by stamping, ensuring longer service life and providing added security on residential and apartment doors Child Safety and Anti-Theft Features: Set window wedge to a safe opening and anti-theft, spring button lock can enhance the anti-theft performance and provide reliable protection Easy Installation for Inward Opening Doors: Suitable for doors that open inward where door frames and doors must be flush, including the mounting screws shown in the picture for easy installation and maintenance Compact and Sturdy Dimensions: Main part measures 8.2 × 4.2 cm / 3.2 × 1.6 inch (L×W) with chain length of 180mm / 7 inches, sturdy and durable, offering visible security Visitor Identification Security: Prevents full opening of door, allowing visitors to be identified before fully opening the door, and can only be unlocked when the door is closed Complete Installation Package: Includes one slide bolt door chain latch and eight nickel-plated carbon steel screws for secure mounting and hassle-free installation, Weight: 0.440924524 pounds, Manufacturer: YUOIP