The ALPHA6 aluminum rings are the result of rigorous testing on hundreds of thousands of units in some of the harshest environments worldwide. Developed through intensive trials, Sig Sauer's proprietary aluminum alloy ensures unmatched durability while remaining ductile enough to perfectly conform to the riflescope without harming the main tube during installation. With an optimal balance of weight and strength, the ALPHA6 system is built to perform in any environment, from coastal flats to rugged mountain terrain. Compatible with 35mm main tubes, providing flexibility for sight selection 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 A leveling tool kit is provided with all compatible ALPHA6 ring sets for precise installation Covered by Sig Sauer's infinite guarantee, ensuring long term reliability