1. Stainless Steel The Chain Door Guard is constructed of stainless steel. It has a 5 inch body length, a 6.7 inch chain length, and the chain is 1/16 inch thick. The material features high hardness, corrosion and rust resistance, and is strong and durable to help deter break-ins. Stainless steel is used for our chain lock, door chain lock, door chain and chain locks for inside doors. 2. Anti-Theft Design - Child & Pet Safe With a Spring Anti-Theft Press Lock, it provides improved performance and reliable protection against intruders. Protect your family with an extra locking device for front and interior doors. The security locks for doors inside and the chain lock for the front door can also be used to secure your space or to allow small pets to pass in and out. 3. Hand Brushed Finished The h-q stainless steel hand brushed finish offers a pure and attractive appearance and helps prevent rust for long life. Choose from finishes including brushed nickel, matte black, red bronze, gold and bronze to fit your doors and complement contemporary home decor. 4. Secured Viewing Or Ventilation The heavy duty chain latch is a security locking device for doors that allows viewing and ventilation while the door is partially open, providing added security for home and office doors. It cannot be unlocked from the outside to guarantee your safety. Typical use scenarios - Front door: keep the door partially open to see and speak with visitors while maintaining security. - Interior doors: allow access for children or pets while still restricting full entry. - Office or apartment doors: ventilate while keeping spaces secured when needed.