Simply put, TRUGLO manufactures bright ideas. When TFX PRO sights immediately took off and gained critical acclaim, TruGlo decided that the world of TRITIUM night sights needed a similar upgrade. Starting with the brightness and durability of their original TRITIUM night sights, they added all of the 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