Special three-dimensional hinge system for adjusting the leaf on the x, y and z axes. Because wood is a live material, a window can shift slightly over time. This type of hinge allows the leaf to be adjusted to the frame to guarantee perfect closure over the years. The hinge is coated with PP plastic with a choice of 4 colours (see accessories page). The Trend hinge in the Vecchi Tempi and Epoca models is only applicable to a tilt leaf.