Glowing bright both day and night TFX sights are always ready. TFX takes Truglo's award-winning Tritium + Fiber-Optic technology even further with all the features their 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. TFX sights will amaze even the most discriminant shooters. Fully protected TFO technology encapsulated in a virtually indestructible configuration Impervious to oils chemicals cleaning solvents and ultra-sonic cleaning processes Excellent 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 Novak LoMount cut replacement sights are designed for 1911-style handguns with existing fixed Novak LoMount dovetail cut slides however some fitting may be required. Installation by a competent gunsmith is recommended.