Materials Description: rail, connecting rod and rivet: stainless steel 430. The metal tail plug: zinc alloy. Plastic Fittings: Nylon with glass fiber. Data evaluation: Function: cycling test by ultra 25,000 rpm. And meet BS 6375 PT.1: 2004 & PT2: 1987 requirements. Corrosion resistance: BS EN 1670:1998 grade standard. Open angle: meet BS 5588:1998 PT1: 1990 B requirements of building codes and meet BS 8213 PT1: 1991 standard. Features: opening angle of 90 degrees, the structure is simple, easy to use. Reliable service life guarantee. The tail plug compressible flexible design, the windows in each switch can be a better seal and secure. High grade stainless steel 430 material. WINDOW STAY total stacking height of 13 and 17 mm, suitable for all popular window type. Standard and extended two structures can be applied to all UPVC window type.