All QD (Quick-Detachable) swivel sets contain the locking-style Super Swivels for extra security against accidental opening. The Super Swivel,with its patented SwiveLock feature, is detachable, but contains a positive locking mechanism. 1" swivel for 1" slings. Swivels are mounted on rifles, shotguns and muzzleloaders in a variety of ways. Each swivel set contains all necessary hardware to attach the swivel to the fore end and butt of the particular firearm for which it is designed.