Metal Material: Window restrictors are made of carbon steel, thickened material, high strength. High-temperature Teflon baking paint, anti-rust, corrosion-resistant, strong gloss, and more beautiful. Hook Design: The door and window opening and closing limiter adopts a hook design, which has greater stability, is not afraid of wind, and is not easy to fall. More safety. Riveting: After many high-strength pull tests, it is not easy to deform, strong, and permanent. Perfect for windy days to prevent slamming or opening windows, increasing comfort when using windows. Ensure the durability, sturdiness, and longevity of your door lock. Easy to Use: Hanging window supports are used to block the opening angle of windows and balcony doors. You can use it to ventilate your apartment properly and control and adjust the opening of windows according to your needs.