When it comes to tritium gun sights, aluminum sleeves and painted-on white rings are the norm. Night Fision breaks the mold, literally. The patented, injection molded sleeve design not only holds the tritium vials securely in place, it creates a brighter and more durable ring, called The Perfect Dot, that provides maximum visibility both day and night. FeaturesPerfect Dot Night Sights with added daytime florescent or phosphorescent ringBrightest Tritium Night Sights on the marketCNC Machined out of high quality steelBlack Nitride coating used to improve wear and corrosion resistance DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.