TRUGLO Trusite Xtreme TG4302B Compact Micro Adjust Sight (Black) Ultra-fine click adjustment for windage and elevation. Tool-less design. One-piece head reduces vibration. TFO pin uses our patented combination of Tritium and Fiber Optic technologies. Aperture has a 1.6" inner diameter. Compact circular field of view. Glow-in-the-dark shooters ring helps align peep sight. Adjustable level with two vertical bars. Level is illuminated by luminescent shooters ring. Reversible bracket for greater vertical adjustability. Adjustable for left and right handed shooters. Three sets of markings for elevation, windage and pin adjustments.