Check the listing for details. Fishing Rolling Swivel with Interlock Snap, 20 Pack 55LBS Line Connector, Black. Condition: New. Listed at 7.16 USD. The rolling swivel with interlock snap is used to connect the line leading from a rod to a lure to untwist the line to avoid tangling during retrieval.SpecificationColor: BlackMaterial: Copper&IronSurface Treatment: Nickle PlatedStrength: 25kg / 55 lbsWire Diameter: 0.8mm / 0.03 inchOverall Length: 42mm / 1.65 inchRing Outer Diameter: 4.5mm / 0.18 inchPackage Content: 20 x Rolling Swivel with Interlock SnapAdvantage1. This swivel connector is made of polished copper and stainless steel. Smooth surface will not cut fishing line.2. Rolling swivel can ensure 360-degree rotation flexibility under strong tension, thus reducing twist to a minimum.InstructionJust tie the fishing line connected to the fishing rod to the ring of the swivel.NOTE: Please confirm the size and strength of the snap swivel you need before ordering.