Ruger 90321 Clam Pack Single Ring Medium 30mm Diameter Hawkeye Matte Blued - Specifications: - Length: 5.0 - Width: 2.8 - Weight: 0.150 - Type: Ring Single - Tube Diameter: 30mm - Finish: Blued - Size: Accepts up to 42mm - Material: Alloy - Height: 0.9