OS2 RC (ANTI-BURGLARY) The OS2 system is perfected in its solid and precious lightness, offering the range of RC openings certified anti-burglary, without sacrificing its minimal profiles and its precious materials, brass, corten, steel and galvanized steel. OS2 has reduced sections also in burglar-proof windows, only 47 mm for the side node and 62 mm for the central node in double-leaf windows.