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 through doors. Effective protection for both children and pets. Our window restrictors are adjustable and allow ventilation while keeping children safe. Two opening sizes to choose from: 5.12 inches (13 cm) and 6.30 inches (16 cm). Simply change the circular knob and adjust the spacing to your preferred setting. Window restrictor locks come with strong adhesive for secure attachment without drilling. Just peel off the protective film and apply directly to windows or doors. Adhesive reaches full strength after 24 hours. Easy to remove using a hair dryer without damaging the window surface.