The need of different kinds of locking systems is much more required. According to the height, standard windows require a good positioning of locking points to prevent wood bending and ensure good compression of the gaskets. On anti-burglar windows the locking points must be placed within certain interaxis and be as close as possible to top and bottom hinges. For this reason, components like central locks, terminal elements and extensions, have different dimensions, trimmable or not, are easy to assemble, allow customer to avoid trimming the components (except for windows dimensions that require trimming of some elements to reach bottom corner for RC2).