'Chains' in the Bible

And when Herod was going to bring him forth, that night Peter was sleeping between two soldiers, bound with two chains, and guards before the door kept the prison.

And lo, an angel of the Lord came there, and a light shone in the prison: and having smitten the side of Peter, he roused him up, saying, Rise up quickly. And his chains fell off his hands.

Then the chiliarch came up and laid hold upon him, and commanded him to be bound with two chains, and inquired who he might be, and what he had done.