The XS Standard Dot Night Sights are designed to enhance your defensive revolver. The sights use a tritium lamp coupled with a proprietary photoluminescent orange or green Glow Dot that absorbs ambient light and glows in low light. The convex dot's additional surface area increases light absorption, intensifying the Glow Dot's charge. Designed to be large and highly visible, these sights help solve many issues, from aging eyes to deteriorating vision. XS Tritium Night sights are big, bright, and easy to see day or night!The XS Sights Standard Dot for the Taurus 66C revolver fits guns with a factory pinned in front sight. The replacement sight is pre-drilled for the retention pin, making installation an easy at home DIY task. FeaturesTritium-powered front sight Photoluminescent Glow Dot absorbs ambient light and glows in low lightHigh-contrast colored front sight Easy installation - Factory drilled for roll pin12-year warranty on TritiumDurable CNC-machined steelKit Includes: front ...