When Truglo TFX PRO sights immediately took off and gained critical acclaim Truglo noticed that the world of TRITIUM night sights needed a similar upgrade. Starting with the brightness and durability of their original TRITIUM night sights Truglo added all of their PRO level features now including an orange FOCUS-LOCK ring for increased front sight contrast. Front sight FOCUS-LOCK ring for even faster focus Angled rear sight edge for emergency one - hand operation Unmatched visibility in all shooting conditions 24/7 Compact design maintains factory sight radius Assembled in USA with quality Swiss tritium for maximum brightness Glows in the dark - no batteries or light exposure required FORTRESS FINISH nitride protective coating Fits standard holsters