Material Specifications: Hardware: cold rolled steel. Gearbox: zinc alloy. Surface Treatment: electric color zinc trivalent chromium blunt thickness 20-25U technical requirements: 25,000 times the safety and reliability of the test. Surface comply with BS EN 1670:1998 standard. Features: new trivalent chromium silver galvanized. Straight flat outer strips (guide member), and also has U-shaped grooves. Eccentric cam high margins 20, 22, 25 MM 7, 8, 10 mm door. Window wall panel, suitable for most window type. Suitable for UPVC window. Also applies to wooden windows and aluminum windows.