Usage Tips:1. Professional Scope Leveling Kit: The scope mounting kit comes with 1 scope level for fixing the clamp, 2 reference levels for placing on your rail or the open turret caps of your scope to make better adjustments, 1 Allen Key for adjusting the Scope Leveling Kit. All for scope leveling and precision2. Higher Accuracy: The upgraded calibration distance of the scope leveling kit is 10mm, which also has a clearer scale, enabling the leveling bubble to be measured more accurately and effectively, reducing working errors. All the scope levels are carefully checked before the factory3. Adjustable & Magnetic: With the adjustable knobs of the scope level, you can easily attach it to the equipment, fit around up to 1.97' in diameter. The reference levels is equipped with a strong magnetic base, ensuring a secure and stable placement4. Aluminum & Protective Silicone: The scope leveling kit is crafted from a sturdy aluminum alloy for durability and a smooth touch. The scope leveling kit inside features a rubber soft pad that effectively prevents any scratching of your expensive equipment