Sig Sauer's ALPHA6 aluminum rings have been pushed to the limits, undergoing extensive field testing in unforgiving environments across the globe. The result, A proprietary aluminum alloy that offers superior durability while maintaining the ductility needed to securely grip your riflescope without damage. Designed for peak performance in the toughest conditions, the ALPHA6 system strikes the perfect balance of weight and strength, excelling from the coastlines to the high-altitude scree fields. 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