This swivel set comes with two Allen Magnum swivels that fit most pump action and semi-automatic shotguns without hardware installed and the swivels are designed for slings up to 1 in W. Contains the necessary hardware to install swivels on most pump action and semi-automatic shotguns. A threaded stud designed for installing into wood or synthetic stocks is included for the butt stock attachment. A rotating stud that requires drilling the factory magazine tube cap is included for attaching to the fore end.