The barrel ball bearing swivel is used to connect the line leading from a rod to a lure to untwist the line to avoid tangling during retrieval.SpecificationColor: SilverStrength: 33kg / 72 lbsMaterial: Stainless SteelSurface Treatment: Nickel PlatedOverall Length: 20mm / 0.79 inchRing Inner Diameter: 4.2mm / 0.17 inchPackage Content: 25 x Fishing Snap SwivelsAdvantage1. Ball bearings can ensure 360-degree rotation flexibility under strong tension, thus reducing twist to a minimum.2. This swivel connector is made of nickel-plated stainless steel. The coating that does not easily peel off ensures good rust resistance and durability.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.