This Trijicon HD Night Sight Set was created specifically to meet the requirements of tactical shooters, and the sights are covered by a 12-year warranty that guarantees usable illumination. This night sight set was designed to fit Glock models 20, 21, 21SF, 29, 30, 36, and 41. This Trijicon Night Sight Set includes two high-definition, three-dot green tritium sights. The front sight has a yellow outline and features a tall blade and luminescent aiming point. The rear sight has a U-shaped wide notch and a black outline