MB Crunch Proof In-Line Swivels are the heaviest and smoothest operating swivels ever offered to the trapper. The body of the swivel is much thicker than multi-purpose swivels, making it virtually impossible for coyotes or other large animals to close the swivels. Each swivel comes with two 6 Gauge J-Hooks. Strong enough for the toughest wolf, wolverine, bear or mountain lion if the J-Hooks are welded. These are Extra Heavy Duty In-Line trapping swivels.