The Ameriglo Green Tritium Single Dot, No Outline .316" H .165" Square Notch Rear Sight is designed to fit most SIG Sauer and Springfield XD models, including the Hellcat (non OSP). Featuring a green tritium insert without an outline, this rear sight provides excellent visibility in low-light conditions. The .316-inch height and .165-inch square notch offer a clear and precise sight picture. Ideal for self-defense and tactical applications, this rear sight ensures reliable performance and enhanced accuracy. Ameriglo Green Tritium Single Dot, No Outline .316"H .165" Sq Notch Rear Sight for Most Sig/Springfield Models, Hellcat (non OSP) SG-101R