Sea-Dog Line Anchor Swivel are designed to easily slide over anchor rollers, preventing snagging, minimizing wear on the bow roller and windlass. These precision, high quality swivels feature double locking pins for extra security. Can be used between anchor and chain or between chain and line. Constructed of corrosion resistant investment cast AISI 316 stainless steel. Pin threads must be coated with Blue Loctite or Anti-seize to prevent galling.