The Keystone 30mm scope rings are designed to provide exceptional value and are proudly manufactured in the USA. Selecting the appropriate scope rings can be challenging, but our Keystone 30mm scope rings simplify this process. They are compatible with both picatinny and weaver rails and are precisely machined with a full cross-bolt, ensuring secure mounting of your scope. These 0.85 low 30mm scope rings are suitable for most scopes and rifles, provided the objective lens (bell) is 50mm or smaller. Recognizing the demand for a domestically produced, mid-tier scope ring that is versatile, durable and cost-effective, we developed the Keystone series scope rings to fill this gap in the market. The component is precisely manufactured internally using advanced CNC machining centers, ensuring high-quality and accurate production standards 6061 aircraft-grade aluminum is a high-strength, corrosion-resistant alloy known for its excellent machinability and weldability, ideal for aerospace applications The T15 mounting hardware is specifically designed for securely attaching ring caps, ensuring stability and precision in various applications The chromoly crossbolt, paired with a 1/2 inches nut, ensures consistent and dependable engagement, providing reliability and repeatability in performance Compatible with both picatinny and weaver-style rails, this product ensures secure and versatile attachment for a wide range of tactical and optical accessories The horizontally split design facilitates straightforward installation, ensuring a seamless and efficient setup process for users, enhancing overall usability EGW Keystone rings incorporate a fiber washer to prevent the nut from damaging the clamp's finish The measurement of our rings is taken from the point where the ring rests on the top of the base to the midpoint of the ring