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. Green tritium lamps are warranted for 12 years from date of manufacture.SPECIFICATIONS  Fits:  Make Glock  Fits Model:  17, 17L, 19, 22, 23, 24, 25,  26, 27, 28, 31, 32, 33, 34, 35, 37, 38, 39, and 45  Front Lamp Color:  Green  Rear Lamp Color:  Green  Front Paint Color:  Orange  Rear Paint Color: Black  Front Blade Width:  0.144 in. (3.65mm)  Front Blade Height:  0.215 in. (5.46mm)  Overall Front Blade Height:  0.268 in. (6.8mm)  Rear Notch Style:  U-Notch  Rear Notch Width:  0.169 in. (4.29mm)  Rear Blade Height:  0.231 in. (5.86mm)  Overall Rear Height:  0.321 in. (8.15mm)  Fiber Color:  Red / Green