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These Picatinny rings are heavy duty and are made from solid aluminum billet. They are carefully machined as pairs to ensure the best possible alignment. To achieve this, each pair is clamped together and the center holes are bored to a diameter of 30mm with an accuracy of +/-.0014". Then, each pair is engraved with a matching serial number to ensure they are easily identifiable. Additionally, the lower halves of the rings are marked so they cannot be separated from their matching ring caps. The edges are beveled or radiused to reduce the chance of catching on other gear. The surfaces are blasted to create an even, matte finish and then hard anodized with a black finish that adds strength and wear resistance. The crossbolt and nut are made of chrome-moly steel and heat treated for extra strength before being blued. The four steel Torx® screws on each ring also match the finish. These rings also have a separate option of precision-machined polymer inserts that can be used with 1" diameter scope tubes.