General description 4pcs Window Opener Door Window Restrictor Lock is designed to enhance security for UPVC windows. Made from high-quality materials including UPVC, wood, aluminum, and metal, this restrictor lock is durable and resistant to deformation, ensuring a long service life. It features a cable that limits the opening width of the window, which can be easily removed with a key for convenient access. Technical specifications Material: UPVC, wood, aluminum, metal Includes: 4 restrictor locks, keys, self-drilling screws Installation Easy to install with provided self-drilling screws Requires only a screwdriver or drill for installation Usage Limits the distance windows can open to ensure child safety Suitable for most types of windows and doors Ideal for private, public, and commercial applications