Black steel threaded rod Dia:Min 2 mm Surface :Zn SGS ... field 1,Name: Black steel threaded rod ;Steel threaded rod;Black threaded rod2,For the similar threaded rod ,what can we do ... ?(1), Ability for the material of this kind of threaded rod: Grade3.6,4.6,4.8,5.6, ... the surface finish: ElectroplateZinc plated(while,colour,dacroment),Nickel plated,copper plated,gold plated,chrome(3+Rohs &6+ ) plated, ...