The Meprolight Tru-Dot Night Sights provide combat-proven self-illuminated targeting for Smith & Wesson 1911 pistols featuring tritium-powered illumination and Novak-style compatibility with green/green dot configuration.Meprolight Tru-Dot Self-Illuminated Night SightsDesigned specifically for S&W 1911 pistolsNovak-style cut for direct replacement installationTritium-powered - no batteries or switches requiredGreen front and rear sight dots for consistent sight pictureEffective in daylight low-light and nighttime conditionsHighly durable construction for tactical applicationsPerfect for law enforcement military and civilian shooters who need reliable sight acquisition under any lighting conditions these sights dramatically increase hit probability on both stationary and moving targets.