AmeriGlo GL-201 Pro-idot Org For Glk 17/19: 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.Features :"Green tritium front" .140" wide with orange front outline"Green tritium rear".180" with square notch"Quick vertical sight alignmentFast target acquisition