Glowing bright both day and night, TFX 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. TFX sights will amaze even the most discriminant shooters. -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 -White FocusLock Ring increases speed and accuracy -Black Retention Rings improve front sight acquisition and reduce glare -Fits Gun Models: Sig Sauer #6 Front, #8 Rear Sets.