Restrictors
Window restrictors are a popular locking product not only for security but for safety too. When fitted to a window, a restrictor limits how far the window can be opened. This has the obvious security benefit of allowing you to ventilate your house securely.
Leading manufacturer, Jackloc, have helped raise a greater awareness for both domestic and commercial properties of the danger of falling from windows. As such, they are a popular choice for schools and homes alike.