Ruger 90316 Clam Pack Single Ring High 30mm Diameter Target Gray Stainless - 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.