Uncle Mike's pioneered the modern swivel in 1947 and has continued to make the strongest, most reliable swivels on the market. Any other brand is a weak link between you and your firearm. Tri-Lock assures silent operation and zero finish wear by completely eliminating swivel contact with your gun. Other swivels can mar your finish and make noise against your stock. Swivel Lock is a spring loaded plunger and a knurled, threaded sleeve that locks down to completely eliminate accidental opening of the swivel. Uncle Mike's swivels are positively secured for the long haul. Closed Link technology creates a permanent ring bond that will never fail you. It was the first of its kind and started the entire generation of Uncle Mike's QD Swivels..