These are custom-made swivels. The 1-1/2" wide loop better fits the thick leather slings used in Bushcrafts slings. The push-button plunger is recessed to prevent accidental release.
Sold as pairs (2 swivels).
If you are buying as an upgrade to a new sling order, choose the lower-priced "ADD-ON" variation; they will be installed on your sling instead of the traditional swivels that come with it.