... , carbon steel,alloy steel, Finish:Zinc plated, Plain,Black,etc Size: M5-M30 Standard: DIN,ISO,BS,AS,JIS,ASTM,Non-standardThread ... : unc, unf, metricSurface: Zinc,Black,Plain , etc. Packing: bulk packed ... . Looking forward to long-term and fruitful cooperation with you. DIN 6921/Hexagon Flange Bolts