Apex Gear Bone Collector 4 Light 19/10 Detachable Bracket Sight, Black Extra-long, fully protected wrapped fibers. Micro, stainless steel tubes protect fibers. Unique dual-end fiber design allows for increased pin brightness and compact size. Ultra-fine click adjustment for windage and elevation. Tool-less design. Adjustable level has two vertical bars. Reversible bracket for greater vertical adjustability. Laser markings for windage, elevation and pin adjustments. Large circular field of view. Aperture has 2 inner diameter. Glow-in-the-dark shooters ring. Adjustable for left and right handed users. Micro push-button light included. Reversible quick-detach bracket with detent settings and adjustable hard-stop.