As written by the maker of this Swivel: Minnesota Trapline Products is proud to offer you the heaviest and smoothest operating in-line swivel ever made available to the American Public. We initially designed and manufactured the MB (Minnesota Brand) Crunch Proof Swivel solely for use on our MB-650 Coyote and Bobcat trap however as more and more of our customers saw the swivel and wanted them on their own traps, we decided to sell them separately as well. Coyotes can not close the MB Crunch Proof Swivel body down on the J-hooks causing the swivel to freeze-up like other swivels are known to do. This swivel will definitely hold its own against the toughest critters that you will ever face. Two heavy duty tempered #6 J-Hooks are provided with each swivel body for in-line use. For use as the heaviest stake swivel or drowner lock you've ever had the pleasure of using, simply remove one rivet. 105" thick swivel body! Made in USA Tempered #6 J-Hooks