When it comes to tritium gun sights aluminum sleeves and painted-on white rings are the norm. Night Fision breaks the mold literally. Our patent-pending injection molded sleeve design not only holds our tritium vials securely in place it creates a brighter and more durable ring we call The Perfect Dot? that provides maximum visibility both day and night. Features:Perfect Dot? Night Sights with added daytime florescence Brightest Tritium Night Sights on the market CNC Machined out of high quality 4140 steel Black Nitride coating used to improve wear and corrosion resistance made in specialized factories Specifications for Night Fision Perfect Dot Night Sight Set, Square Rear, Glock: Manufacturer: Night Fision Gun Make: Glock Color: Black Sight Style: OEM Height Fabric/Material: 4140 Steel Illumination Type: Tritium Illumination Color: Green Additional Features: Square Rear Condition: New Finish: Polymer Features of Night Fision Perfect Dot Night Sights: Perfect Dot Night Sights with added daytime florescence. Brightest Tritium Night Sights on the market. CNC Machined out of high quality 4140 steel. Black Nitride coating used to improve wear and corrosion resistance. Installation: Contact Professional Gunsmith Maximum nighttime visibility through the use of tritium self-powered illumination. Brighter than leading competitors through use of 30% more tritium. Scientifically engineered colorants in the Perfect Dot provide optimal visibility in daylight. Unparalleled durability. Innovative Perfect Dot provides a consistent, brilliant outline that won't flake, chip, or wear over time. Package Contents: Night Fision Perfect Dot Night Sight Set w/Front, Square Rear , Pistol Sights