General description 4pcs window and door restrictor locks are designed to enhance security by limiting how far windows can be opened. Made from high-quality UPVC, wood, aluminum, and metal, these locks are durable and resistant to deformation, ensuring a long lifespan. The locks come with keys for easy operation, allowing you to fully open the window when needed. Technical specifications Material: UPVC, wood, aluminum, metal Includes: 4 locks, keys, and self-tapping screws Installation Easy to install with provided self-tapping screws Requires only a screwdriver or drill for installation Usage Limits the opening distance of windows for enhanced child safety Suitable for most types of windows and doors Ideal for home, public, and commercial applications