1. **Material** It is made of good materials, can withstand relatively high pressure and is not easily damaged. 2. **Excellent Safety** It is equipped with flow-resistant cables, which helps ensure safety and health in the home environment, especially focusing on the safety of babies/children. 3. **Easy Installation** It is made of a 19 - centimeter long steel wire and comes with self - drilling screws and a wrench. Installation can be completed with just a screwdriver or an electric drill. 4. **Wide Application** It is suitable for PVC, aluminum, wooden, and composite doors and windows. It can be used for double - hung windows, casement windows, and sliding windows; balcony doors, guest bedroom doors, etc. 5. **Locking and Unlocking** The special limit design can achieve a 19 - centimeter limit and ensure ventilation. After pulling out one end of the cable with a wrench, the window can be fully opened. 6. **Color** White When the cable is in place, the opening distance of the window is restricted. The cable can be removed from one end with a wrench to fully open the window. The shape has smooth lines and can be bent at will. The cable can be stretched up to 18.5 centimeters. The lock core design improves the safety of the door lock.