The Sash Stop Window Restrictors are designed to enhance safety, security, and ventilation for sash windows. These key-lockable restrictors help prevent windows from opening too far, reducing the risk of accidents and improving child safety. By limiting the opening, they also deter intruders while still allowing controlled airflow. Supplied with a key and strike plates for secure installation, these restrictors offer a practical and discreet solution for both modern and traditional sash windows.