Description The Window & Door Safety Lock. According to the Royal Society for the Prevention of Accidents (RoSPA) an estimated 4000 children under the age of 15 are injured by falling out of windows each year. In order to prevent this from happening RoSPA recommend that there should be a means of limiting the opening of any window where the cill level is more than three meters above external ground level. Our security cable window restrictor offers you that peace of mind for a small investment and is suitable for use on all kinds of windows and doors including UPVC, aluminum, wooden and metal profiles. The 20cm long cable provides a 10cm opening as recommended by the RoSPA. This enables the windows to be opened enough to allow sufficient ventilation but not enough for someone to fall out. A key is also provided so that the restrictor can be locked as required and also so the window can be fully opened when necessary. This means that the restrictor can be used on fire escape windows providing the key is kept in easy reach of the window. The restrictor is ideal for homes, hotels, student accommodation etc. It also provides an added benefit of extra security, the restriction of how much the window can be opened prevents burglars from being able to use the window as an access point. These restrictors are very easy to install and comes with four steel screws for fitting. The restrictor consists of a zinc alloy body, a nickel plated pin and a steel wire rope which is 20cm long.