TRUGLO Pendulum 1-Pin TFO Sight Adjustable Bracket Black EXTREMELY quiet. The most advanced treestand sights available. Automatically compensates for distances up to 35 yards. TFO pin uses our patented combination of Tritium and Fiber Optic technologies. Pendulum can be locked in place for ground shooting. Extra, extra-long, protected, wrapped fiber. Aperture has a 1.8" inner diameter. Circular field of view. Glow-in-the-dark shooters ring helps align peep sight. Level with two vertical bars. Level is illuminated by luminescent shooters ring. Adjustable for left and right handed shooters. CNC machined. Ultra-light and compact. Fixed or adjustable bracket.