... treament:oil dip or other 4.Certificate: ISO9001 Construction Fastener 1. Material: Gray iron & ductile iron & malleable ... destination, DDU named place of destinationAbout UsAs a professional fastener & hardware supplier in China, Dalian Leading Metal Ltd. ... specialize in component fastener field includes nuts, bolts, washers, screws,pins, rivets, anchors per international standard IFI, ANSI, DIN ...