Minnesota Trapline Crunch Proof Swivels Built with a .105-inch thick swivel body for maximum durability;Tempered #6 J-hooks for added strength;Designed for use with MB-650 Coyote and Bobcat traps;Prevents freeze-ups caused by large animals closing the swivel body;Suitable for trapping large predators, including wolves, bears, and mountain lions;Recommended for any animal trapped in North America;Made in the USA for superior quality and craftsmanship