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 Available Precision Matched 35mm Rings MPN Height Optical Centerline PMR-35-95 Low .95" PMR-35-1.00 Medium 1" PMR-35-126 High 1.26" Learn More About Vortex Precision Matched Rings Vortex Scope Alloy Rings 35mm Medium 1.00" PMR-35-1.00