Truglo TG13WA3PC TFX Pro Sight M2 Pro Set Fully protected TFO technology encapsulated in a virtually indestructible capsule; Impervious to oils, chemicals, cleaning solvents, and ultra-sonic cleaning processes; Contrasting orange front sight FOCUS-LOCK ring for even faster focus Unmatched visibility in all shooting conditions 24/7; Glows in the dark--no batteries or light exposure required Machined and assembled in the USA with quality Swiss tritium for maximum brightness; FORTRESS Finish nitride protective coating Angled rear sight edge for emergency one-handed operation; U-notch rear sight for increased speed and accuracy Evaluated and recommended by National Tactical Officers' Association (NTOA) field testers; Fits standard holsters