Machined with certified USA 7075 T6 billet aluminum and held to an extremely tight tolerance of .0005 inches using a precision Computer Numeric Controlled (CNC) mill. These Vortex rings are then serialized, vibratory tumbled, bead blasted and finished with a Type III hard coat anodize. Rugged, lightweight, anti-snag design Robust, Grade 8 fasteners 100% made in USA guaranteed for life Will work with Weaver and Picatinny mounts Available Precision Matched 1 inch Rings MPN Height Optical Centerline PMR-01-76-W Low Weaver .76" Learn More About Vortex Precision Matched Rings Vortex Precision Matched Rings (Set of 2) 1-Inch (.76 Inch / 19.3 mm) Weaver PMR-01-76-W