Leupold steel Standard (STD) rings and bases are the most versatile mounting systems available and this specific model is designed to fit a Husqvarna HC, making it an excellent choice for standard calibers under .300 Win. Mag. These STD rings come in five different heights and are precision-engineered to perfectly align with STD 1-piece or 2-piece bases. The front dovetail ring pivots, allowing for lateral adjustments using the rear windage screws during bore sighting for precise alignment. Shims can also be applied to reserve your scope's elevation adjustments for BDC (bullet drop compensation) dial applications, giving you flexibility for long-range shooting. Leupold understands the critical importance of the connection between your scope and firearm, which is why their mounts are designed to be as rugged and dependable as the Leupold optics they secure. With a wide variety of mounting systems available, Leupold ensures you'll find the perfect match for your firearm and shooting style. Made in the USA and built to endure a Lifetime of heavy use, Leupold mounts deliver unmatched performance and reliability in the field or at the range.