Leupold`s mounts are every bit as rugged and dependable as the Leupold optics they`re intended to secure. With a huge variety of mounting systems, for nearly every type of firearm under the sun, you`re sure to find the perfect match for you firearm, and your style of shooting.FEATURES: Machined steel construction Versatile, available for many different rifles Forward part of the base accepts a dovetail ring, locking it solidly into position Rear ring is secured by windage adjustment screws Long Range STD mounts provide a 15-MOA slope of built-in elevation compensating for bullet drop at extreme ranges STD rings are engineered to match up with STD 1-Piece and STD 2-Piece bases Five different ring heights are available for STD bases.