TRUGLO TRITIUM PRO HANDGUN SIGHT SET: When the lights go out, your sidearm doesn't need to be left in the dark. The TruGlo Tritium Pro Night Sights transition from standard white dot sights during the daylight, to glowing green dots in the dark. Tritium does not need batteries and does not need to be charged with light - it simply glows! This TruGlo Gun Sight Set is compatible with FN Handguns. MAIN FEATURES: - Front sight Focus Lock ring for even faster focus; - Angled rear sight edge for emergency one-hand operation; - Unmatched visibility in all shooting conditions 24/7; - Compact design maintains factory sight radius; - Assembled in the U.S.A. with quality Swiss tritium; - No batteries or light exposure required; - Fits most standard holsters; ABOUT TRUGLO: TRUGLO is the leading manufacturer of fiber-optic sights, tritium handgun sights, and shooting accessories for crossbows, and handguns. We're a Texas company. Inherently, that means we like our guns, and slinging lead a long way. From target archery to tactical competition, TruGlo has accessories to improve your gear. Regardless of your outdoor sporting interest, we have gear that's optimized for your style and budget.