【WINDOW SECURITY LATCH】This window restrictor has a multi-turn powerful spring, which can effectively fixes the limit and prevent dangerous accidents caused by children climbing the window. It is a simple safty device that limits the openning distance of the door or window, and also there's no worry of the shut of the window by strong wind. 【SAFTY OPENING ANGLE】The opening angle of this window limiter is 65 degrees, the max distance of the opening window is much smaller than the distance which babies will fall out of the window. It can help to fix the window and meet the request of ventilation. It can help make your home a safer place for your babies! 【QUALITY MATERIAL】This window stopper adopts durable and thick limit point and adopts stainless steel material, with high durability, excellent performance and can be used for a long time, so that it can be able to withstand greater pressure, provides safe window closing and opening in hospitals, hotels, homes, schools and shop. 【EASY TO INSTALL】This window safety guards for children adopts left side installation and comes with 2.5mm thick and flat bottom plate and 4 mounting screws, just need a screwdriver or drill to install. Suitable for internal and external opening window with a 14‑17mm distance between the window frame and the sash.