TruGlo Tru Site Xtreme. The Tru-Site Extreme features extra-long, protected fiber-optic pin wrapping on a single plane to eliminate distortion. The extra-large, 2"-diameter, lighweight composite pin guard affords a wide field of view along with a glow-in-the-dark shooter's ring to aid peep-sight alignment. Vertical adjustment has a generous range, and the bracket is reversible for right- or left-handed shooters. You can lock in your adjustments without concern about them coming loose. There are two vertical bars on the level and three sets of markings for exact windage, elevation and pin adjustments. Includes a fully violet LED to reduce pin glare. Pin diameter is .029". Fully assembled.