Vortex 30mm Medium Precison Matched RingsCrafted from certified USA 7075 T6 billet aluminum, our Precision Matched Rings are engineered with meticulous precision, boasting an ultra tight tolerance of . 0005. Utilizing state of the art Computer Numeric Controlled (CNC) milling, we ensure unrivaled accuracy in every set. Maintaining consistency is paramount in our manufacturing process. Each pair of rings is meticulously matched, guaranteeing seamless performance from one set to the next.