General description 4pcs Window Restrictor Latch is designed to enhance security by limiting how far windows and doors can be opened. Made from high-quality materials including UPVC, wood, aluminum, and metal, this restrictor is durable and resistant to deformation, ensuring a long service life. It features a cable mechanism that allows for easy operation with a key, enabling full window opening when needed. Technical specifications Material: UPVC, wood, aluminum, metal Includes: 4 restrictors, keys, self-drilling screws Installation Easy to install with provided self-drilling screws Requires only a screwdriver or drill bit for installation Usage Limits the distance windows can be opened for enhanced child safety Suitable for domestic, public, and commercial applications