Reinforcement Design The back of the lock is designed with a screw-reinforced anti-pinch arm. so that the base and the lock arm are tightly integrated. which is more durable. avoids loosening. and provides your kids and pets with more security.Give you a sense of security! Security This window lock protects your family and acts as a burglar deterrant. The limited opening of the window can prevent a child from fitting or falling through the gap. It can also be used to circulate air without allowing pets in or out of the house. The child lock can be unlocked allowing for access to window in case of emergencies. Strong Material The window lock is made of high-quality aluminum alloy.door and window lock durable. sash locks not easy to rust. and has a white paint finish. Sash Blockers Are Designed to Provide Additional Security for Your UPVC/PVC Doors and Windows. Easy to Install and Use The sash stopper can be easily installed using the included fixing screws. just follow the installation instructions provided. Just twist the interference arm to lock or release the window sash. Wide Usage These Window Latch are suitable for PVC-u and wood/composite doors and windows. such as room doors. windows. bathroom doors or balcony windows.etc. The window sash lock set can also be given to your friends and family as an indispensable family gift to provide security for their lives. which can easily get their welcome and love.