Why invest in a riflescope and then attach it to your rifle with a substandard mount? Leupold`s mounting systems are as rugged and reliable as the Leupold riflescopes they`re intended to secure. No matter which mount you choose, you can count on it for rock-solid dependability and tack-driving repeatable accuracy. These bases are extremely affordable and exceptionally well-made.FEATURES: STD 1-piece and STD 2-piece bases are engineered to match up with STD Rings Machined steel construction Versatile, available for many different rifles Forward part of base accepts a dovetail ring, locking it solidly into position Rear ring is secured by windage adjustment screws Five-different ring heights are available for STD bases.