Designed for AmeriGlo by well-known M&P customizer David Bowie for a sleek, ultra-low-profile fit on the Smith & Wesson M&P pistol. The rear sight notch is wider and deeper than the factory notch to help you get the front sight centered ASAP. Rounded corners prevent snagging that can impair the draw from concealment. Mfg: Ameriglo SPECS: Machined steel, matte black finish. Tritium Front - .435" (11.1mm) long, .140" (3.6mm) wide, .230" (5.8mm) high. Target Front - .400" (10.2mm) long, .140" wide, .230" high. Tritium & Target Rear (All) - .875" (22.2mm) long, .720" (18.3mm) wide re