The HI VIZ NITESIGHT(TM) Tritium Front & Rear Set for Glock 9mm, .40 S&W, and .357 SIG showcases the latest technology in an ultra-durable, laser-sealed tactical tritium lamp. This scientific effort results in a hard core sight that will last through the most demanding conditions for years to come. The combination of a white halo and tritium bring razor sharp target acquisition instantanously in all light enviorments.