New Version of Window Opener Locks----: Popular window locks limit how far a window can be opened. They can be removed from one end and the window can be fully opened with keys. Perfect for child safety and anti-theft. High Quality Materials --- The baby window locks are made of high quality aluminum, able to withstand greater pressure, provide more security, Home Health & Safety & Baby/Child Safety Smart Design----: Window locks with special 19cm limitation design provide 11-16cm restriction and let in the door. fresh air, and the window can be fully opened after removing the cable at one end using the key Easy to install and many applications ------: This window opener for PVC items comes with screws and wrenches and just a screwdriver or drill to install. And this window opener is suitable for most types of windows and small doors, suitable for many types of materials such as PVC, wood, aluminum and metal. Package Content -- ---: Our 4 window openers come with 4 window openers, 4 release keys and 16 screws.