For shooters who demand the highest level of strength and precision, VortexA(R) Precision Matched Rings are the only choice. Each is made from certified American 7075-T6 billet aluminum and Type III hardcoat anodized for the ultimate in corrosion resistance and durability. Even under the relentless recoil of a .300 Win. Mag., they stay tight. Made from certified USA 7075-T6 billet aluminum Held to extremely tight tolerances of .0005" Vibratory tumbled, bead-blasted, and finished with Type III hardcoat anodized finish Fits Picatinny rails Robust grade 8 fasteners Order today!