Package contents - A set of scope levels including 2 small reference levels, 1 barrel clamp level, and 1 Allen wrench, all stored in a compact case. Accuracy and calibration - Each level has an integrated bubble level for precise measurement and calibration. - The scope leveling kits are factory calibrated for reliable performance. Versatility and fit - The adjustable barrel clamp level fits around even the largest diameter barrels, including shotguns with scope or red dot sights. Durability and protection - Constructed from precision machined aluminum with an anodized finish. - The non-marring pads protect the barrel clamp level from scratching the gun. Use scenarios - Mounting a scope on a precision rifle: use the kit to ensure the scope is level for consistent elevation and accuracy. - Setting up a shotgun with a scope or red dot: clamp around the barrel to verify and maintain a level sight plane. - Field maintenance and zeroing: perform quick checks to confirm level alignment before shooting to help prevent inconsistencies in point of impact.