Glowing bright both day and night TF sights are always ready. TFX takes our award-winning Tritium + Fiber-Optic technology even further with all the features our customers requested: compact snag-free design longer sight radius and amazingly durable construction built to handle just about anything. Illuminating elements are encased inside a virtually indestructible chemical and shock-resistant capsule and the CNC-machined steel is protected with a rust-proof FORTRESS FINISH. There is even a highly visible white ring surrounding the front fiber to make it even more visible encouraging the eye to rapidly focus on the front sight for a fast and accurate sight picture. The first and ONLY of it's kind Fully protected TFO technology encapsulated in a virtually indestructible configuration Impervious to oils chemicals cleaning solvents and ultra-sonic cleaning processes Unmatched visibility in all shooting conditions 24 / 7 Utilizes quality Swiss tritium for maximum brightness Glows in the dark No batteries required Concealed fiber can not be seen by target FORTRESS FINISH? provides a permanent protective coating for maximum protection Snag resistant design Fits standard holsters Patented