The Ameriglo I-Dot Pro Night Sights are an excellent way to add low-light capability to your handgun. The front sight is .140 wide to accommodate the bright Tritium insert and bright orange ring. The rear sight features a wide .180 squared rear notch that is undercut to eliminate glare and extended toward the shooter to increase sight radius, even on compact models! The rear sight also features a single Tritium insert located in the center of the notch, allowing fast and easy sight acquisition. Simply dot the 'i', and you'll see why Ameriglo is America's leader in weapon sight development.