Ensures child safety: This window child safety lock limits the opening distance of windows and doors to reduce the risk of falls. Allows for fresh air circulation. Suitable for most hinged, casement, and sliding (horizontal or vertical) windows made of wood, PVC, and aluminum. Convenient design: Simply turn the key to unlock. The 360° rotatable steel cable swings out of the way when unlocked, regardless of plate installation side or angle. Easy installation: Features self-adhesive mounting brackets for drill-free installation. Once the cable is in place, window opening is restricted; the key removes the cable from one end for full window opening. Can also be installed with included screws for extra security. Wide application: Used on casement windows, hung windows, awning windows, sliding windows, etc. Suitable for homes, hospitals, schools, universities, and offices. Peace of mind: Never worry about your child opening a window and falling. Also prevents children from opening refrigerators, drawers, cabinets, and vanities – a great child safety lock.