The locking Giuditta ®, beyond the variety of its uses, i.e., randomly, the horizontal rotation, the vertical opening and the "ventilation" position, is supplied of limiters of opening with adjustable clutch depending on the needs, and of devices against false maneuvers, which don't allow the simultaneous openings of the various hubs (for the rotation) and which avoid the fall of the shutter. Moreover, thanks to the 180 degrees spin and to the use of selective glasses in order to control the solar exposition during summer and winter, the energetic consumptions can be remarkablly reduced. .