This new shackle swivel is a hit.  Designed for the serious dredge fisherman.  With a 2,000 pound breaking strength it can withstand almost a ton of force.  Made of hardened 316 stainless steel and built in ball bearing swivel.  The quick link keeps it secure and closed even in high vibration fishing tactics.  For use on any style of dredge with the largest of weights and speeds necessary for dredge fishing for billfish.