Truglo's Brite-Site Tritium night sights transition from standard white dot sights during the daylight, to glowing green dots in the dark - no batteries or light exposure required. Assembled in the USA with quality Swiss Tritium for maximum brightness, these sights utilize CNC-machined steel construction with a snag-resistant design fitting standard holsters, and Truglo's Fortress finish permanent protective coating for maximum protection. This set is compatible with Sig #8 Front/#8 Rear sets.