When it comes to tritium gun sights, aluminum sleeves and painted-on white rings are the norm. Night Fision breaks the mold, literally. Their patented, injection molded sleeve design not only holds the tritium vials securely in place, it creates a brighter and more durable ring, they call The Perfect Dot(TM), that provides maximum visibility both day and night.Features:a Perfect Dot(TM) Night Sights with added daytime florescent or phosphorescent ringa New, Updated Serrated Sight Bodya Brightest Tritium Night Sights on the marketa CNC Machined out of high quality steela Black Nitride coating used to improve wear and corrosion resistancea Installation: Gunsmith Recommendeda Built in the USA with Swiss Tritiuma Fits Glock 42, 43, 43X