Security grilles are protective barriers made of metal that are designed to secure openings like windows and doors. They are often used in commercial spaces, such as shops and warehouses, to deter theft and vandalism while still allowing visibility and airflow. These grilles can be either fixed or retractable, providing flexibility in how they are used. When closed, they create a strong physical barrier, but when opened, they can be neatly tucked away, maintaining the aesthetic of the space. Overall, security grilles offer a practical solution for enhancing safety without sacrificing accessibility.