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. Rugged, lightweight, anti-snag design Robust, Grade 8 fasteners 100% made in USA guaranteed for life TORQUE SPECS Base Clamp Screws 45-50 in/lbs Ring Screws 15-18 in/lbs INCLUDED IN THE BOX 2 Precision Matched Rings Torx wrench