'Iron' in the Bible

Now there was no iron-worker in all the land of Israel: for the Philistines said, For fear the Hebrews make themselves swords or spears:

For they had instruments for putting an edge on their ploughs and blades and forks and axes, and for putting iron points on their ox-driving rods.

The stem of his spear was as long as a cloth-worker's rod, and its head was made of six hundred shekels' weight of iron: and one went before him with his body-cover.