Sigs' proprietary steel alloy ALPHA3 Scope Mounts are machined with an exactness that is both strong yet ductile that allows our rings to form around a riflescope, yet will not damage scope under proper installation. The steel rings are epoxy powder coated to prevent oxidation and resist gun oils, cleaning solutions, and outdoor exposure. FEATURES: Steel Weaver-style clamps Covered by SIG SAUER's Infinite Guarantee Torq specifications for Alpha 3 Scope Mounts: To Rail (1/2in Nut): 65in/lbs To Scope (T15-TORX): 25in/lbs Mfg: Sig Sauer, Inc.