The Leupold steel STD bases and rings are the most versatile of any mounting system we offer. The rear ring is secured by windage adjustment screws, allowing the scope's internal adjustments to be reserved for precise sight-in. Additionally, shims can be used for gross elevation adjustment, reserving the scope's elevation adjustment for bullet drop compensation dial applications. Matte finish. (mounts) Bases for many popular rifle models available. (mounts) Forged and Machined steel construction. Versatile, available for many different rifles. Windage Adjustable (STD Mounts) Long Range STD (STD Mounts) Maximum Accessability (2 pc. Mounts) 2 Piece Bases (Mounts) STD Rings