Simply put, Truglo manufactures bright ideas. When TFX PRO sights immediately took off and gained critical acclaim, we noticed that the world of Tritium night sights needed a similar upgrade. Starting with the brightness and durability of our original Tritium night sights, we added all of our PRO level features to give you the advantage when you need it the most.Features:Front sight focus lock ring for even faster focusQuick and accurate U-notch designAngled rear sight edge for emergency 1-hand operationAssembled in USA with quality Swiss Tritium for maximum brightnessUnmatched visibility in low-light shooting conditions or complete darknessUtilizes quality Swiss tritium for maximum brightnessGlows-in-the-dark - no batteries or light exposure requiredFortress finish provides a permanent protective coating for maximum protectionSnag resistant design/fits standard holsters