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Description:XY-F58 thermal insulation cold-bridge interior and exterior open casement window series (European style groove) Features: 1) Heat insulation aluminium profile and hardware fittings 2) Interior-open-interior-tilt, interior and exterior open casement 3) Can freely fitted with sliding windows and doors, reasonable jointed, extremely convenient to install 4) Reasonable structure made by modularization, saves more materials and hardware fittings 5) Can inside and outside open and close 6) Needs only one stator to fix up 7) High security