1.Precision hex bolt & turned part 2.Good quality at competitive price! 3.Accord to the ROHS and the ISO Certification Our factory ... ,plastic & mould. Such as precision metal turned parts,rivet,screw & nut,pin,shaft,terminal etc; which are widely used in the ... are made of iron, Stainless steel, copper, aluminium, alloy steel and meet the ROHS and the ISO Certification special hex bolt