Fish Bone Double color 2 times Red dot.   2x fixed magnification red dot sight with 30mm blue coated objective lens, red & green dual illuminated dot reticle for all light conditions. Nitrogen filled fully sealed tube delivers shockproof, fogproof & waterproof performance. Coin-style windage/elevation turrets for precise zero adjustment. Fishbone top rail design supports extra attachments, flip-up lens caps protect optics, standard 20mm mount for quick installation. Compact lightweight build ideal for outdoor hunting and tactical shooting.