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1.Frame & Sash Thickness: 1.4mm; Out-frame: 90mm/108mm/135mm width2.Glass Sash: Outward opening; Gauze Sash: Inward opening3.Hardware Slot: K Slot Design, no necessary to milling the slot to install with the wind brace4.This system designs with three cavity to meet the requirement of energy-saving, and it always usethe wood grain on the indoor and other surface treatment on the outdoor part.5.Frame cut in 90° then connected by screw,sash cut in 45° then connect by the angle connector .6.Glass slot:31mm; could install with 6+15A+6tempered glass