Apex Gear Atomic 4-Pin Sight .019" Sight Extra-long, fully integrated / protected wrapped fibers. Thin metal blades support fiber and increase visibility. Unique dual-end fiber design allows for increased pin brightness and compact size. Ultra light and compact. Large circular field of view. Aperture has 1.8 inner diameter. Glow-in-the-dark shooters ring. Pivoting elevation bracket reduces total sight components. Adjustable level has two vertical bars. Adjustable for left and right handed users. Laser markings for windage & elevation adjustments. LED light included. Violet LED Light included.