High quality.The door chain lock is made of high quality 304 stainless steel, which is strong, wear-resistant and durable.Its surface is polished and galvanized for enhanced rust resistance and a beautiful burr-free surface.Easy to install.There are two installation methods, using nail-free glue, no need to punch holes, or fixing with screws, this door lock can be used on all types of wooden or metal doors, and can be placed above or next to the door panel.The latch is very easy to install and very strong.Security lock.There is a button with a spring-loaded security push-lock.The chain can be opened by pressing the safety button, effectively preventing outsiders from reaching into the inner hook and dislodging the chain.This design allows you to drop the chain and protect your house more intimately.Anti-theft design.The design of the safety catch can prevent the chain from falling off and prevent the bad guys from taking advantage of it.The special design of the safety door chain lock is that it can be unlocked inside the house and the thief can't unlock it from outside, thus ensuring your safety and giving you a full sense of security.Wide application.The door chain lock is suitable for opening and closing the inner door, which is strong and durable and can be widely used for the security of home, hotel, apartment and compound doors.Color: BlackSize: 123*21mm/71*30mmProduct list: 2*bolt door lock