The Shotgun Swivel set by Allen comes with two magnum swivels that fit most pump-action and semi-automatic shotguns without hardware installed. The swivels are designed for slings up to 1-inch wide. It 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 buttstock attachment. A rotating stud that requires drilling the factory magazine tube cap is included for attaching to the fore-end.