The heaviest and smoothest operating swivel offered. The body is .105" thick on the swivel. Coyotes and large dogs cant close the crucnh Proofs swivel body down on the J-hooks causing the swivel to freeze like others do. These are recommended for any type of trapping in North America. Strong enough to support wolf, wolverine, bear, or mountain lion if the #6 J-Hooks are welded. These swivels are sold by the dozen.