Talley Scope Mount/Ring Combo features a 30mm tube diameter and High mount height (Front: 0.600, Rear: 0.710, centerline: 0.650) for Christensen Arms Ridgeline and Mesa long-action rifles (cross-compatible with Remington 700 Long Action and Bergara B14 platforms). This 2-piece set features direct-to-receiver 1-piece ring and base construction attaching with 6-48 hardware. Made from aluminum with a black finish, it weighs 2.90 oz and provides 20 MOA offset. Safety Note Always ensure the firearm is unloaded before installing or adjusting any optics or bases. Verify proper torque specifications during installation. Improper mounting may affect accuracy and safety.