Pack of 2 Stainless Steel Swivel Bar Door Braces, Safety Chain Retainers, Recessed Steel Ball, Brushed Nickel, Supplied with Screws Door locks are safety locking devices for swing doors. They allow the door to be opened a few centimeters for safe viewing or ventilation. Child Safety Lock The secondary safety lock can also be placed out of reach of children so they cannot open the door themselves and enter or exit dangerous areas. Steel Ball Positioning Unique locking design that keeps the locking arms in place so they don't swing for added security. Specification: Material: Premium Stainless Steel Color: Satin Nickel Finish: Beautiful brushed nickel finish Application: Perfect for Home; Office; Hotel; Motel; Apartment and Commercial How to install: 1. Choose the correct location for the door and align its main body with the subframe, then make marks; 2. Secure the main body to the door frame with screws; 3. According to the mark, secure the subframe to the door with screws; 4. Close