Vortex starts with certified USA 7075 T6 billet aluminum and hold it to an extremely tight tolerance of .0005 Inch using their precision Computer Numeric Controlled (CNC) mill. The Precision Matched Rings are kept in pairs throughout the manufacturing process - ensuring perfection from one set to another. These Vortex rings are then serialized, vibratory tumbled, hand-bead blasted and finished off with a Type III hard coat anodize.
These Precision Matched Rings position the center of the riflescope tube at a height of .87 Inch (22.1 mm) from the base. Sold two rings per package.