1)DIN931 HEX BOLTS 2)finish : Zinc plated / Yellow zinc plated / Plain 3)Usage : ... requirements!We can also supply produces include different standars of hex bolt, DIN933, DIN931, DIN912,DIN6921,DIN603,A307, A325 for ship ... , please feel free to contact with us, thank you. DIN931 HEX BOLTS