Shackle
Sea Terms
An iron horse-shoe shape which closes across the end with a movable bolt. It either secures with a thread (screw shackle) in one of the eyes of the shackle, or is provided with a pin which is either slipped through the hole in the outside end of the bolt, or by a wooden pin passing through the shackle-eye and bolt. This latter is used on chain cables, so that the bolt may be knocked out readily and the chain slipped.