For tactical shooters, this Trijicon Novak Cut HD Night Sight Set features a yellow photo-luminescent paint outline, tall blade, three-dot green night sight, black wide U-shaped notch rear sight, and steeply hooked front surface. This sight fits Colt 1911 Novak low mount dovetail cut models. The Trijicon HD Night Sights were built the tactical shooters in mind. The three dot green or yellow tritium night sight sets front sight features a taller blade and an aiming point ringed in paint. The rear sight is outlined in black and features a wider U-shaped notch which allows for increased visibility. It also This unique configuration increases visibility and accelerates front sight acquisition even in fluctuating lighting. Additionally, the front surface of the rear sight is hooked to assist in emergency one-handed slide operation. Professional installation recommended. Trijicon 1911 Novak HD Night Sight Yellow CA128Y