Fits Glock Models: 17/17L, 19, 22, 23, 24, 26, 27, 33, 34, 35, 38 and 39.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. The Hard Duty Night Sights are designed to shine-even in the most demanding conditions.Green tritium lamps are warranted for 12 years from date of manufacture.