Feature: Using the most advanced design oDouble-Equal Pressure Cavityâ?� for the water and drain-proof. Simple & rational Aluminium profiles & structure, luxurious exterior appearance Easy to assemble, processing and install. Multi-functional opening: free folding, tri-sash folding, four-sash folding etc., which are convenient to slide. Design of Europe standard notch, according with the collocation of Europe standard hardware, adopts the back-wedge hinge, easy to install.
