Thick nut ISO9001:2008 Grade :4.8,5.8,6.8, ... steel Finished :plain,black,zinc Certificate:ISO9001:2008 Specification Long Thick nut ISO9001:2008 Size of nut:M3~M64 Materail :carbon ... ),Flange bolt,Flange nut,hex nut(GB6170 GB6171 GB1229 DIN934),Thick nut,lock nut etc.