These swivels have no-wire/no-plastic all-metal construction with stainless steel spring. The one-piece body won't contact a firearm when the sling is installed. It also has machine-finished surfaces. Per pair. Available:
Talon Q/R Swivels 1", 1-1/4".
Talon Q/R Swivels with screw set (includes wood screw and machine screw with nut), 1", 1-1/4".
Used them for a shotgun restoration and worked great. Easy to instal and the packaging gives you all of the info. You will need for the drill bit size and depth.