Designed for large caliber rifles with high recoils. The twist-and-lock action of the rings ensures a strong connection with the one or two-piece base. Machined steel construction. Leupold's trademarked Dual Dovetail system provides a classic low-profile mount for scopes on a variety of popular actions. Bases accept all Leupold rotary dovetail rings. Dovetail connections at both front and rear provide a rock-solid mounting platform. 1" Ring.