Uncle Mike's Quick Detachable Marlin .357 Magnum / 1894C Carbine Split Band Sling Swivels (Blued, 1-Inch Loop) 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 Special Magnum split band swivels to install on magazine tube without dismantling gun Swivel Lock spring-loaded plunger and a knurled, threaded sleeve eliminates accidental opening of the swivel Closed Link technology creates a permanent ring bond