Ameriglo GL353: This UC Tritium sight set is designed with large, highly visible front for rapid sight acquisition. It has a green tritium lamp with a luminescent outline front sight and round notch, serrated steel rear sight. This model fits Glock 17, 19, 22, 23, 24, 26, 27, 33, 34, 35, 37, 38, 39. It has an orange outline, 140\" Wide Front, 165\" Notch, U-Notch Black Serrated Rear.