* Aluminium alloy 6063-T5 is used to create advanced profiles and strengthening materials. *High quality glass fiber thermal break insulation bar with high loading capacity *10-15 years warranty in powdercoating 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. *Instead of ordinary glue, glass panel EPDM foam weather sealing strip provides higher performance and ease of maintenance.