'Iron' in the Bible

Thou shalt break them with a rod of iron; Thou shalt dash them in pieces like a potter's vessel.

His feet they hurt with fetters: He was laid in chains of iron,

Such as sat in darkness and in the shadow of death, Being bound in affliction and iron,

For he hath broken the gates of brass, And cut the bars of iron in sunder.

To bind their kings with chains, And their nobles with fetters of iron;