Ultra-fine micro adjustment for windage/elevation. Tool-less design. Extra long, protected, wrapped fibers. Aiming dots aligned on same plane eliminate distortion. 1-piece head reduces vibration. Lightweight composite pin guard. Aperture with 2'' inner diameter. Large round circular FOV. Glow-in-the-dark shooter's ring helps align peep sight. Adjustable red level with 2 vertical bars. Level is illuminated by luminescent shooter's ring. Reversible bracket. Adjustable for left-& right-handed shooters. 3 sets of markings for elevation/windage/pin adjustments. Note: Lighted models are designed to reduce unwanted glare.