Made of mirror-polished AISI316 stainless steel. Features: hidden external screws; water drain deep angle; fitted with trimming ring and flyscreen; adjustable wing nut locking (no overhanging parts); smoked acrylic lens; CE approved for area 1 category 1; special mounting system: a single and fast move is enough to fit the portlight into the trimming ring, which means labour cost saving for the shipyard.