flan free maintain it is convenience to install highly flexibility 1) Size: 1/2-48 inch (DN15-DN1200)2) Standard: ANSI, JIS, DIN, BS4504, SABS1123, EN1092-1, UNI, AS21293) Type: Plate, Slip-on, Welding Neck. Thread, Socket Weld, Blind Flanges4) Material: A105, SS400, SF440, RST37.2, S235, C22.8, F304, F304L, F316, F316L, 316Ti5) Surface Treat: Anti-rust Oil, Transparent/ Yellow/Black Paint, Zinc, ...