The unique Quick Detachable (QD) design stops the metal swivel body from contacting the gun. The close machining tolerances provide smooth and silent operation. Super Swivels do not include studs. All others include studs or barrel bands, depending on type.FeaturesForend adapter with stud installes in the barrel band of gun Fits: Ruger (10/22, 44 Magnum, and number 3 carbines) Includes: 1-forend adapter with stud, 1-wood screw (1/2") for optional forend stud mounting, 1-wood screw rear stud, and 2-qd swivels for 1" slings