Fits 1911 Novak Low Mount Dovetail Cut models. - The HD Night Sights were specifically created to address the needs of tactical shooters. - The three dot green tritium night sight sets front sight features a taller blade and an aiming point ringed in photoluminescent paint while the rear sight is outlined in black and features a wider U-shaped notch. This unique configuration increases visibility and quickens front sight acquisitioneven in transitional lighting. - Additionally the front surface of the rear sight is steeply hooked to assist in emergency one-handed slide operation. - Green tritium lamps are warranted for 12 years from date of manufacture.