A premium scope level CNC milled from 6061 aluminum. Ensure your crosshairs are level, as cant will cause considerable shot dispersion at longer ranges! Streamlined design sized to sit just over the side-focus knob on almost all optics, but not stick out farther than necessary. Hinged design installs quickly and is low profile enough to fit under most optics without removing for install. Setting level vial is very simple, with only one bolt to tighten, eliminating fiddling to get the level positioned perfectly.