A low-profile, highly durable design that fits on most setups without removing optic. Hinged construction results in just one bolt to tighten, easing installation and reducing setup time. Level vial is located to sit just over windage and focus knobs, or can be placed on the bottom side of the scope tube if desired. Open top lets in the maximum amount of light, while still offering substantial protection to the level vial. Milled from 6061 Aluminum with a Type III Hardcoat Anodization. Available in 1", 30mm, and 34mm main tube diameters.