The Mil-Force Swivel has a patent-pending design constructed from investment cast steel. Refined lines reduce the overall weight while increasing strength. It meets or exceeds all military specifications. The industry-leading strength is suitable for the hardest working firearms on Earth and it fits any standard swivel stud.Patented design constructed from investment cast steel. Refined lines reduce overall weight while increasing strength. Meets or exceeds all military specifications. Pull tested to over 600lbs of tension. Industry-leading strength is suitable for the hardest working firearms on Earth. Fits any standard swivel stud.