Glowing bright both day and night, TFX Pro sights are always ready. TFX Pro 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-resistant FORTRESS FINISH. Features: Fully protected TFO technology encapsulated in a virtually indestructible capsule Impervious to oils, chemicals, cleaning solvents, and ultra-sonic cleaning processes Unmatched visibility in all shooting conditions 24/7 Assembled in USA with quality Swiss tritium for maximum brightness Glows in the dark - no batteries or light exposure required Front sight FOCUSa LOCK for fast and accurate shooting Concealed fiber cannot be seen by target FORTRESS FINISH nitride protective coating Fits standard holsters Patented