Material: The anti-theft window lock is made of solid die-cast zinc structure, with a durable powder-coated surface, durable, smooth white finish, and can be used for a long time. You will receive 4 window locks and matching screws. Security: Installing a window lock on the window can protect your children and pets, and also prevent thieves from entering your home, making your stay safer and more comfortable. Easy to install and use: The window stopper can be easily installed with the included mounting screws, just follow the included installation instructions. Simply turn the stopper arm to lock or release the window sash. Application: These window locks are suitable for PVC-u and wood/composite doors and windows. It is also suitable for vertically sliding, single-hung, and double-hung vinyl windows. Multiple functions: you can use the vertical sliding window lock on windows and sliding doors; 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 win their welcome and love.