【Heavy Duty Stainless Steel】The Alise Chain Door Guard is constructed of stainless steel.About the door chain lock heavy duty: 5 inch length body; 6.7 inch chain length; Material thick:1/16 inch thick.H&Q steel material features high hardness, corrosion and rust resistance, strong & durable, better to prevent break-in.The stainlee steel is used for our chain lock,door chain lock,door chain and chain locks for inside door. 【Anti-Theft Design -Child & Pet Safe】 With Spring Anti-Theft Press Lock, Increase safety performance, offers Reliable Protection Against Intruders.Protect your family with an extra locking device for front and interior doors.The security locks for doors inside and chain lock for front door, can also be used to baby-proof your space or for small pets to get in and out of the house safely. 【Hand Brushed Finished】The h-q stainless steel hand brushed finish,pure and beautiful appearance, to ensure the chain door lock not easy rust and long service life.Choose to fit your doors with additional locks in brushed nickel,matte black, red bronze,gold and bronze,which is a perfect match to contemporary home decoration. 【Secured Viewing Or Ventilation】The heavy duty chain latch is a security locking device for doors, which ensures safe viewing and ventilation while door is partially open, providing added security for your home and office doors. It can not be unlocked from the outside to guarantee your safety. 【Trouble-Free Installation】 Installation is quick and easy – additional security for your home or office doors are within reach! All installation hardwares are included in the package,so you can mount it easily.