Ensure Child/Pet Safety: The childproof window locks, window restrictors for upvc effectively restricts the opening distance of windows and doors, helping to reduce the risk of children falling, while maintaining fresh air flow. Choose HIYAA child safety lock for your family's safety Upgraded Window Restrictor: The size of the window safety locks is 7.5*3.2cm, suitable for the width of most windows, with a wide range of application window types: wooden, PVC, casement windows, sliding windows, etc. It ensures children's safety while maintaining indoor fresh air flow, creating a healthy and comfortable environment. Use window safety restrictors to protect children well 2 Installation Options: The window lock has 2 installation options for you to choose from - self-adhesive and included screw fixing for simple and easy installation. Once you have installed the window security locks, your windows and doors will be firmly secured and can only be opened with a key, preventing unaccompanied children or pets from opening the window and falling. Our windows do not come with pre-drilled, please use a drilling tool to punch out the holes before installing with screws Sturdy and Durable: The window restrictors for upvc is made of sturdy metal heads and high tension steel cables, which can withstand significant horizontal force and is very durable. Ideal for high-rise buildings, homes with children and pets Wide Applications: Child safety locks are not only used for windows, but also for fridges, cabinets, drawers, toilets, etc., ideal for homes and schools to give protection to children, and prevent your children or pets from going to dangerous places, enhance safety in specific areas