Bluewings(TM) Hunting New Studs Base Studs Sling Swivel Screw This is a set of Swivel Bases. These Studs will mount on just about any rifle and will accept most brands of sling Swivels. Studs can be used on both Wood & Synthetic Stocks. Comes with 2 Screw bases and 2 White Spacers. Easy way to add a sling to your rifle. Fits all swivels & Bipods Package Included:2pc Sling Swivel Screw