These ruger scope rings are individually clamshell packaged allowing customers to purchase only the ring they need or mix and match without the added expense of purchasing two rings at a time.Rings are made of alloy or stainless steel and are available to fit 1" or 30mm tube diameters.Finishes include stainless matte blued or ruger's signature finishes of hawkeye matte stainless hawkeye matte blued or target gray stainless.Type: Ring SingleTube Diameter: 30mmHeight: MediumSize: Accepts up to 42mmFinish: MatteMaterial: AluminumOne Or Two Piece: 1