Tritium Handgun Glow-in-the-Dark Night Sights for Glock Pistols UNMATCHED VISIBILITY in low light shooting conditions or complete darkness; GLOWS IN THE DARKno batteries or light exposure required At night, sights are GLOWING GREEN DOTS; In daylight, sights are standard BRIGHT WHITE DOTS Made of tough, CNC-machined steel with a FORTRESS FINISH COATING for maximum protection SNAG RESISTANT DESIGN fits standard holsters; SQUARE-NOTCH DESIGN is duty proven Fits Glock 20, 21, 25, 28, 29, 30, 31, 32, 37, 40 and 41 (Excluding M.O.S models)