All-steel swivels are made in the U.S.A. and contain no plastic parts to crack and fail when you least expect it. Quick-detach feature allows you to use one sling for several rifles. Swivel attaches to mounting stud and locks down with knurled cylinder nut to prevent accidental opening. Available for 1" or 1A 1/4" wide slings. Swivels are available in pairs with or without mounting studs. Model GTSW-23 uses a wood screw front stud, all other sets use a front stud with machine screw and nut or specific hardware for attaching to a magazine tube or barrel. Mfg: Grovtec Us SPECS: Steel, blued, matte finish.