Leupold steel Standard (STD) rings and bases are among the most versatile mounting systems offered. This specific model is designed to fit a Browning European and is an ideal choice for standard calibers under .300 Win. Mag. The STD rings, comes in five different heights, are precision-engineered to pair with STD 1-piece or 2-piece bases. The front dovetail ring pivots to allow for lateral adjustment via rear windage screws during bore sighting, ensuring accurate alignment. Shims can also be utilized to preserve your scope's elevation adjustments for BDC (bullet drop compensation) dial applications. Leupold understands the critical importance of the connection between your scope and firearm. That's why their mounts are built to be as rugged and dependable as the Leupold optics they support. With a wide range of mounting systems available, you'll find the perfect fit for your firearm and shooting style. Made in the USA and built to withstand a Lifetime of use, Leupold mounts deliver performance and durability you can trust in any environment.