"Minnesota Trapline MB Crunch Proof In-Line Swivels are the heaviest, smoothest-operating swivels ever offered to trappers. Originally these trap swivels were created for use with the Minnesota Trapline's custom MB-650 coyote and bobcat traps; however, they quickly became a customer favoriteso, now they're available for any trap setup. Far superior to other swivels, the bodies are .105"" thick, preventing coyotes from crushing the swivel down on the J-hooks and freezing it up. When paired with welded #6 J-hooks, these Minnesota Trapline swivels are strong enough to handle wolves, wolverines, bears, and even mountain lions. Works with almost any trap setup .105"" thick swivel body delivers strength Crunch Proof design prevents freeze-up Ideal for all North American species Pairs with welded #6 J-hooks"