The raw materials: the rail parts, connecting rod and rivets: 430 stainless steel. Plastic parts: Nylon 6. Data evaluation: Function: cycling test by over 25,000. Corrosion resistance: BS EN 1670:1998 grade standard. With the limit series complies with BS6375 Pt.2 Features: hanging on a range of insurance type and casement type window support, in line with BS7950: 1997 standard. Advanced hook interlocking design, additional connection of the two higher security point of windows and window frames. Is opened flat type 12-inch and 16-inch and 8-inch to 24-inch hanging on the type. The elastic limit structure allows the window stay sliding automatic homing Close. (Only preliminary open 10MM) with limit level window stays open type classification left hand and right hand buttons to two models. With a limit level support only open-type window mounted on the lower side of the window frame.