* Aluminium alloy 6063-T5, high tech profile and renforce material *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 *The smooth surface joint is ensured by the corner locking key, which also increases corner stability. *Glass panel EPDM foam weather sealing strip used for better performance and easier maintenance than standard glue