Swivel Set For Pump And Semi-Auto Shotguns, Designed For Slings 1 inches Wide: Swivel set fits most pump and semi-auto shotguns without hardware installed. Contains necessary hardware to install swivels on most pump action and semi-automatic shotguns. Threaded stud designed for installing into wood or synthetic stocks is included for the buttstock attachment. Rotating stud that requires drilling the factory magazine tube cap is included for attaching to the fore end.