Trijicon 1911 Colt Cut HD Night Sight Set – Yellow Front Outline The HD Night Sights were specifically created to address the needs of tactical shooters. The three dot green tritium night sight set’s 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 acquisition—even in transitional lighting. Additionally, the front surface of the rear sight is steeply hooked to assist in emergency one-handed slide operation. Front - Blade Width (A): 0.144 in. - Blade Height (B): 0.215 in. - Overall Height: 0.390 in. Rear - Notch Width (D): 0.169 in. - Blade Height (E): 0.230 in. - Overall Height (F): 0.355 in.