BHP Double Sardine Rig Swivels feature a 500lb Momoi Rotary ball-bearing swivel, with a Rosco TIG-welded ring and two delrin grommets. Securely crimp mono or fluoro leaders up to 400lb test to the grommets; no chafe gear required. Rotary swivel turns freely on both ends. Allows live baits to swim easily with no tangles.