Easy installation: Pre-drill holes at the correct positions on doors and windows and align the screws with the screw holes to secure the front face of the doors and windows. Versatile compatibility: Suitable for casement windows, interior casement windows, hanging windows, skylights, and similar openings in homes, offices, schools, and other spaces. Lightweight yet durable: Lightweight but strong construction with high durability, impact resistance, heat resistance, and corrosion resistance; not prone to rust. User-friendly and secure: Simple, user-friendly design with lockable window handles for easy and safe closing and reopening. Use scenarios: - Homes and apartments for reliable ventilation and security - Offices and conference rooms requiring quick, safe window operation - Schools and educational facilities needing durable, low-maintenance windows Specifications preserved in spirit: function emphasizes installation, compatibility with various window types, lightweight yet robust materials, and secure, easy operation.