Our aluminum Alpha tactical rings are machined from aircraft grade 6061-T6 aluminum, precision machined and Type-2 black anodized. Designed with the same unique industrial design as our Electro-Optics, our ring mounts not only look tough, but are tough. Features: Aircraft grade aluminum rings for mounting a tactical riflescope Aluminum 2-piece cantilever design with HeliCoils for locking your riflescope down with confidence Covered by Sig Sauer's infinite guarantee Torq specifications for Alpha tactical mounts - to rail (1/2 in nut) it is 65 in/lb, to scope (T15-Torx) it is 25 in/lb