Wooden frame, thickness 56 mm, joining structure between uprights and transoms on both the shutter and the frame with plug and tenon system. The glazing bead profile can have different contours to satisfy the aesthetic needs of buildings and apartments ranging from a modern style up to a classical style. Although only 56 mm thick, it has two perimeter gaskets on all sides of the frame; to eliminate the unsightly impact of the exposed water drainage aluminium profile, the drip channel is built into the bottom transom of the frame; the water flows out of special drains fitted on the bottom transom.