The Redfield, Weaver style, aluminum scope mount rings, are designed to be lightweight and strong. These rings are precision machined from Aircraft grade aluminum for strength while adding a minimal amount of weight to your rifle. These rings feature a Thumbscrew and cross bolt ensuring that you get a snug fit on Weaver style base. Specifications: - material: aluminum alloy - main tube diameter: 1 inch - height: medium - mount: Weaver - finish: silver.