A swivel shackle is a type of rigging hardware used to connect two components, allowing them to rotate freely relative to each other. This rotation prevents ropes, chains, or cables from twisting, kinking, or binding under load, which helps to reduce stress on the rigging system and prolong its lifespan. The shackle in the image is specifically a "jaw-to-jaw" swivel shackle, which has a U-shaped jaw with a removable pin at both ends