TFX is the next generation of TRUGLO's award winning TFO handgun sights. The TFX carries over the TFO technology, for 24 hour usability. The glow-in-the-dark Swiss Tritium and fiber optic combination offers unparalleled visibility. Sealed TFX capsule protects Tritium and fiber optic from oils, chemicals and cleaning solvents. White focus lock ring on the front sight allows for rapid sight acquisition. All of the CNC-machined steel is protected with a rust proof Fortress Finish. TFX Sights are available for Small and Large frame Glocks, as well as the Glock 42. Mfg: Truglo SPECS: Fits - Glock handguns. Construction - Steel. Finish - Black, Fortress. Height - Same as factory.