* Aluminium 6063-T5, a high-tech material for profiles and reinforcement. *High quality glass fiber thermal break insulation bar with high loading capacity *15 to 20 years of warranty on powder coating surface treatment *Multi-point hardware lock system for weather sealing and burglarproofing *Corner stability is improved and the smooth surface joint is ensured by the corner locking key. *Glass panel EPDM foam weather sealing strip used for better performance and easier maintenance than standard glue