Ameriglo’s i-Dot series of pistol sights are easy to use and are highly visible in all lighting conditions, even in complete darkness. The front sight is composed of a tritium lamp (available with an orange, white, or LumiGreen outline), and a rear notch sight with a single green dot in the center. This dot-over-dot configuration delivers quick and easy vertical sight alignment. Features of the i-Dot Iron Sights: Compatible with wide variety of different handguns Dot-over-dot configuration for quick and easy vertical sight alignment Front sight: Tritium lamp with either an orange, white, or LumiGreen outline Rear sight: Rear notch sight with a single green dot in the center Ameriglo i-Dot Green Tritium, Single Dot/No Outline .315"H .18" Sq Notch Rear Sight for Glock (Excl. 42,43,48) GL-101R