Built to endure the world's harshest conditions, the ALPHA6 aluminum rings have been tested on hundreds of thousands of units across extreme environments. Sig Sauer's proprietary aluminum alloy ensures outstanding durability while maintaining the necessary flexibility to conform precisely to the riflescope without causing damage. Striking the ideal balance between lightweight construction and rock-solid strength, the ALPHA6 system is ready for any challenge, from sea level to mountain summits. Compatible with 30mm main tubes and various sight heights for versatile mounting options Machined from Sig Sauer's proprietary billet aluminum alloy, this component offers an exceptional balance of strength, lightweight design and durability The type III flat black hard anodized finish offers maximum wear resistance and longevity Constructed with black oxide hardened steel hardware for enhanced durability and corrosion-resistance Compatible with M1913 and weaver mounts, allowing for versatile attachment options The scope leveling tool is conveniently included with the medium and high 30mm mounts, ensuring precise alignment of your scope for optimal accuracy and performance right out of the box Covered by Sig Sauer's infinite guarantee, ensuring long term reliability