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" wide slings. GTWS-30 uses a low-profile mounting bracket that attaches to the underside of the rib between the barrels (drilling and tapping required) and a A 3/4" screw-in stud for the buttstock. Mfg: Grovtec Us SPECS: Steel, blued, matte finish.