ROLLER FLY SCREEN, SUITABLE FOR FRENCH WINDOWS. FIBREGLASS MESH, 50 MM ROLLER BOX. THE EXTREMELY THIN LOWER RAIL (ONLY 3 MM) MAKES THE PASSAGE EASIER. OPENING THE WINDOW. THANKS TO THE NEW PATENTED SYSTEM, THE GUIDE WILL SLIDE THROUGH THE LENGTH OF THE SCREEN, BECOMING A BARRIER AGAINST ANY KIND OF INTRUSION.