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Precision machined from solid aluminum billet, heavy-duty Picatinny rings come as matched pairs to ensure the best possible alignment. The center holes of each pair are bored to 30mm, and they are clamped together to achieve tolerances of +/-.0014". For identification purposes, matching serial numbers are engraved on each set, while the lower halves are marked to prevent separation from their corresponding ring caps. To prevent snagging on other gear, all edges are beveled or radiused, including both sides of the steel ring nut. An even matte finish is ensured by blasting the surfaces, which are then anodized with a durable black finish to provide added strength and wear resistance. Crossbolt and nut, made of chrome-moly steel, are heat-treated for superior strength and blued. Moreover, four steel Torx® screws with a matching finish are included in each ring. In addition, precision-machined polymer inserts permitting the use of these rings with 1" diameter scope tubes are available separately.