A universal system to make inward opening and outward opening windows. Compatible glazing and gasket structure accept glass from 5 to 24 mm. Unique design of Z-style transform can realize the ideal joint no matter welding or mechanical coupling. Co-extruded glazing bead with lips makes the tight sealant and easy working on assembly. Foil lamination technology available. Outstanding advantage for its economic. Lead free – Calcium-Zinc formulation.