Talley Scope Mount features a 30mm tube diameter and medium mount height (0.500 front / 0.610 rear centerline profile). Designed for Weatherby Model 307 rifles with 8-40 screw configurations (also fits Legendary Arms Works, Nesika Bay, Savage Round Receiver with 8-40 mods, and Stiller Tactical 30/300 or Predator receivers), this 2-piece set of unitized ring-and-base structures is aluminum with a black finish. It mounts directly into factory receiver holes using heavy 8-40 Torx screws and a T-15 wrench without a rail. 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.