Why would he need it?There are no more kids or pets locking you up or locking you in your room. Prevent children from entering certain rooms and exiting through windows without adult supervision.Prevent children from playing with doors and windows and pinching their fingers. Quality Sliding Door Stopperthe children's lock is made of high quality environmentally friendly ABS and double-sided tape. It is durable and easy to install. Easy to UseJust peel off the tape and apply to the intended surface. It will only take a few seconds. It can be so quick and easy! Suitable for a variety of surfacesUsing the sliding door lock, the maximum window opening distance can be 7cm. Prevent children from escaping through the window. At the same time, ventilation and fresh air circulation can be maintained. For Multiple SurfacesThis fuse lock applies to most wooden, glass, plastic and other surfaces. made of metal. You can make your patio doors, closets, showers, shops and sliding doors in entertainment centers, and your sliding windows for children. Note: The data are all manual measurement, please allow 1 - 3cm error, due to the light and display difference, there will be some color difference, depending on the physical object received.