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.Fully protected TFO technology encapsulated in a virtually indestructible capsuleImpervious to oils, chemicals, cleaning solvents, and ultra-sonic cleaning processesUnmatched visibility in all shooting conditions 24/7Assembled in USA with quality Swiss tritium for maximum brightnessGlows in the dark - no batteries or light exposure requiredFront sight FOCUSa LOCK for fast and accurate shootingConcealed fiber cannot be seen by targetFORTRESS FINISH nitride protective coatingFits standard holstersPatented