Fits Colt 1911 Series 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.Features:Enhanced front sight acquisition in bright, transitional and no light situationsOne handed slide manipulation - steeply hooked front surface to assist in an emergency, one handed slide manipulationInstantly visible sight picture in no-light and low-light situations - Tritium phosphor-filled glass lamp illuminates sights for high visibility in all lighting conditionsEnhanced protection from heavy recoil and harsh cleaning solvents - Tritium gas lamps are contained within protective aluminum cylinders and have additional silicone rubber cushioningEvenly distributed light from Tritium lamps - each Trijicon Tritium lamp is capped with a sapphire jewel that helps evenly distribute the light and also acts as an additional layer of protection from puncture and cleaning solvents