General description FLITI 4pcs Window Opener Door Window Restrictor Lock is designed to enhance security for UPVC windows and doors. 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 can be easily removed with a key, allowing for convenient window operation while maintaining safety. 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 opening width of windows for enhanced child safety Suitable for private, public, and commercial applications Compatible with most types of windows and doors