TruGlo TG-231G1MC Tritium Pro Night Sights 3-Dot Low Set Green with Orange Outline Front, Green Rear Nitride Fortress Frame for MOS Glock 17,19,34,35,45 Truglo Tritium Pro starts with the brightness and durability of our original Tritium night sights. All of our PRO level features including an orange FOCUS-LOCK ring for increased front sight contrast for even faster focus, angled rear sight edge for emergency one-hand operation, visibility in all shooting conditions 24/7, compact design maintains factory sight radius and fits standard holsters. Glows in the dark, no batteries or light exposure required Fortress Finish nitride protective coating. Assembled in the USA.