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, aluminum, and sliding windows (horizontal or vertical). Safe: Prevents children from pinching their hands by opening and closing windows or doors without adult supervision; helps prevent babies and children from accidentally falling out of windows or going out through doors. It is effective for both children and pets. The window restrictors are adjustable and allow ventilation while providing safety. Two opening sizes available: 5.12 inches (13 cm) and 6.30 inches (16 cm). Simply change the circular knob and adjust the spacing to your preference. These window limiter locks come with strong adhesive for secure attachment without drilling. Just peel off the protective film and attach directly to windows or doors (adhesive strength improves after 24 hours). Easy to remove using a hair dryer and will not damage the window surface.