Metal material: Window spacers 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. Rivet Rivet: After many high-strength tensile tests, it is not easy to deform, strong and permanent. Perfect for windy days to avoid hitting or opening windows, increasing the comfort of using windows. Ensure the durability, durability and service life of your door lock. Easy to Use: Hanging window stays are used to block the opening angle of casement windows and balcony doors. You can use it to adequately ventilate your apartment and control and adjust the opening of windows according to your needs.