Detailed Product Description Wing nut1/ Various kinds of bolts are available.2/ Is able to made with differenct standard, such as ASTM, DIN, GB etc, class 4.6, 4.8, 5.6, 5.8, 6.8, 8.8, 10.9, 12.9...3/ Surface finishing: galvanized, hot-dipped galvanized, bright, Dacromet...4/ Supply SGS, CE, certificate