REINFORCEMENT DESIGN: The back of the lock is designed with a screw-reinforced anti-pinch arm, so that the base and the locking arm are tightly integrated, which is more durable, prevents loosening, and provides your children and pets with more security. Gives you a sense of security SECURITY: This window lock protects your family and acts as a deterrent to burglars. The limited window opening can prevent a child from inserting or falling through the gap. It can also be used to circulate air without allowing pets to enter or exit the house. The child lock can be unlocked, allowing access to the window in an emergency SOLID MATERIAL: The window lock is made of high-quality aluminum alloy, the door and window lock is durable, the sash locks are not easy to rust and have a white paint finish. Sash stoppers are designed to provide additional security for your PVC/UPVC doors and windows. EASY TO INSTALL AND USE: The sash stopper can be easily installed using the provided fixing screws, just follow the provided installation instructions. Simply turn the interference arm to lock or release the window sash. WIDELY USED: These window catches are suitable for PVC-u and wooden/composite doors and windows, such as bedroom doors, windows, bathroom doors or balcony windows, etc. The window sash lock kit can also be given to your friends and family as a must-have family gift to ensure their life safety, which can easily gain their welcome and love.