Bright looking , perfect design,exquisite craftsmanship, equipping with 5mm +9A+5mm or 5mm+12A+5mm double glazing ensures better performances of sound-insulating and security, Decorative spacer inside the hollow glass makes the impression from bald to deversiform, Euro standard groove design, layer and caement united, Transmitter and handle driving component inside, Multi-lock option available, hinged transmission shaft, open angel from 0 to 90, high performance of weatherproof. EPEM sealer between frame and leaf employing the equal-pressure and decompression principle ensures high-performance of sound insulation, heat insulation, water proof and airtight.