TruGlo Brite-Site Handgun Series Tritium Night Sights, Green Front and Green Rear Sights. Fits Glock 20, 21, 29, 30, 31, 32, and 37.p- Traditional tritium night sights. Uses the brightest tritium available. CNC-machined steel construction. Green front and rear. Fits standard holsters. Snag-resistant design.