Uncle Mike's Non Tri-Lock Sling Swivels (Blued, 1-Inch Loop) The Uncle Mike's quick detachable sling swive set features a unique quick detachable (QD) design that stops the metal swivel body from contacting the gun The close Machining tolerances provide smooth and silent operation Same silence and ruggedness as the original without the tri-lock feature Same silence and ruggedness as the original without the Tri-Lock feature Better fit for molded stocks with molded-in swivel studs Swivel Lock spring-loaded plunger and a knurled, threaded sleeve eliminates accidental opening of the swivel