AmeriGlo Pro i-Dot, 2 Dot Complete Set, Tritium Night Sight, For Glock 17,19,22,23,24,26,27,33,34,35,37,38,39, Green Front with Orange Outline, Green Rear GL-201 The AmeriGlo I-dot Night Sight Sets are ideal for the person who is looking to increase their speed on target in a defensive situation. The I-dot configuration utilizes a dot over dot method for quick vertical sight alignment and fast target acquisition. The I-dots also provide you with an extended rear sight for a bit extra sight radius and a glare reducing undercut rear face. This is a superb design for all shooters. The sights are housed in a steel frame which features a matte black finish.