You will receive a Christmas card as a gift for the Christmas Day! The security lock window restrictor is designed to limit the opening distance of windows and doors to help reduce the risk of injury from falls. Suitable for most casement, wooden, PVC, and aluminum windows and sliding windows (horizontal or vertical). Safe: Prevent children from pinching their hands by opening and closing windows or doors without adult supervision; prevent babies and children from accidentally falling out of windows or going out of doors. It is effective for both children and pets. Our window restrictors are adjustable and can protect children while maintaining ventilation. There are two different opening sizes to choose from: 5.12 inches (13 cm) and 6.30 inches (16 cm). Simply change the circular knob and adjust the door spacing to your preference. Window restrictor locks come with strong adhesive and can be firmly attached without drilling. Just peel off the protective film from the lock and apply it directly to the windows or doors (adhesive performance improves after 24 hours). The lock can be easily removed using a hair dryer and will not damage the window surface.