The Brite-Site TFX features fully-protected TFO technology encapsulated in a virtually indestructible configuration. It provides unmatched visibility in all shooting conditions, uses Swiss tritium, glows in the dark without the use of batteries, and the concealed fiber cannot be seen by target. Additionally, Tru-Glo's Fortress Finish provides a permanent protective coating for maximum protection and its snag-resistant design fits standard holsters. This high suppressor height model is compatible with Glock 20/21/25/28/29/30/31/32/37/40/41.