The QD Super Swivels with Tri-Lock from Uncle Mike's are the super strong swivels you expect from Uncle Mike's with the extra security against accidental opening. The QD Super Swivels offer flawless fit and silent operation that make them ideal for hunting rifles and shotguns. They detach quickly like standard QD swivels, but the Tri-Lock system offers additional security from unwanted opening that no one else can offer.