Description: 【Adjustable】Adjustment Our window restrictors are adjustable and can protect children while meeting the function of ventilation. first gear is 6.10inch in length,second gear is 7.28inch in length. 【Easy to use】Press and hold the slider button on the pole to push or pull the window, achieving the adjustment of the openging size for windows. 【Advantages】Childproof Window Restrictor Prevent babies from pinching their hands by opening and closing windows,climbing on windows,falling out of windows. It is effective not only for babies, but also for pets. 【Universal】Window restrictors are strong and durable, and can be used for inner opening windows, lower window and outer opening windows. 【Wide Application】This Child Safety Window Locks, Easy Installation. Perfect for Home, Public and Commercial Applications. Size Chart: first gear:15.5cm/6.10inch second gear:18.5cm/7.28inch Package Includes: 1 Window Safety Lock Note: Please allow slightly errors due to manual measurement and different monitors.