'Mill' in the Bible

“No one shall take a handmill or an upper millstone [used to grind grain into bread] as security [for a debt], for he would be taking a [person’s] life in pledge.

Then the Philistines seized him and gouged out his eyes; and they brought him down to Gaza and bound him with [two] bronze chains; and he was forced to be a grinder [of grain into flour at the mill] in the prison.

Then the king of Babylon blinded Zedekiah, bound him with bronze shackles and took him to Babylon and there he put him in prison [in a mill] until the day of his death.