Leupold Rifleman Rings are extremely affordable and precision machined from aircraft-grade aluminum, they provide the strength you expect without adding excess weight. Leupold & Stevens, Inc. is an American, family-owned, fifth-generation company that has been designing, machining, and assembling precision optical instruments and other products for 110 years. Founded in 1907, Leupold&';s success has been built on their commitment to the customer&';s absolute satisfaction, and their ability to build the best optics and accessories in the shooting sports market. Leupold Rifleman Scope Rings Specifications and Features: Manufacturers Number 171478 Picatinny or Weaver base mount 30mm Rings Medium Height Precision Machined Made in the USA 7075-T6 Aircraft Grade Aluminum Hard Coat Anodized Finish Matte Black 2 Bases