TFX Tritium and Fiber-Optic Xtreme Handgun Sights for 1911 Pistols UNMATCHED VISIBILITY in all shooting conditions, night or day; GLOWS IN THE DARKno batteries or light exposure required Front sight FOCUS-LOCK RING for even faster focus FX SEALED CAPSULE DESIGN provides maximum protection and durability; FORTRESS FINISH provides a permanent protective coating; Impervious to oils, chemicals, cleaning solvents, and ultra-sonic cleaning processes CONCEALED FIBER cannot be seen by target; SNAG RESISTANT DESIGN fits standard holsters Fits 1911 cut Novak LoMount .270 front / .450 rear (1911 5 Government 9mm / 40SW)