Vortex Optics Precision Matched 1 inch Rings - Machined with certified USA 7075 T6 billet aluminum and held to an extremely tight tolerance of .0005 inches using a precision Computer Numeric Controlled (CNC) mill. These Vortex rings are then serialized, vibratory tumbled, bead blasted and finished with a Type III hard coat anodize. Includes, 2 Precision Matched Rings, Torx wrench. Rugged, lightweight, anti-snag design Robust, Grade 8 fasteners 100% made in USA guaranteed for life Will work with Weaver and Picatinny mounts Torque Specs: Base Clamp Screws 45-50in/lbs, Rings Screws 15-18in/lbs