TruGlo Brite-Site Handgun Series Fiber Optic Red Front and Green Rear Sights - TG131G2Fits Glock 20, 21, 29, 30, 31, 32 and 37Uses traditional fiber optic technology. CNC machined steel construction. Contrasting red front and green rear. Concealed fiber cannot be seen by target. Fits standard holsters. Snag-resistant design.