Night Fision Perfect Dot Night Sight Set w/Front U Rear White Front w/Green Tritium White Rear w/Green Tr Fits Sig Sauer .40 S&W & .45 ACP Caliber. Their patent-pending injection molded sleeve design not only holds the tritium vial securely in place it creates a brighter and more durable ring. For a brighter sight ring with no ring to gather dirt and debris take a look at some of our Tritium & Fiber Optic Night Sights. The Front and Rear sights in this set are a Sig Sauer OEM upgrade with a white outlined circle. The two piece rear sight is designed to work with a Sig Sauer OEM holster. This rear sight has a white outline surrounded by a rust resistant polymer bead. The resin overmolding of the Sig portion of the sight eliminates any potential snag hazards. The Perfect Dot silhouette is created to provide the shooter with a clear aiming point even in bright lighting. The patented Perfect Dot technology achieves both a great look and maximum visibility. The front sight of this Night Fision product provides maximum visibility both day and night. The tritium is an isotope of hydrogen that cannot be created or destroyed by any chemical process. This gives the shooter a bright sight picture all the time. The Perfect Dot technology creates a sight picture that is brighter more durable and more durable than any other night sight on the market. Specifications for Night Fision Perfect Dot Night Sight Set U Rear Sig Sauer: Manufacturer: Night Fision Gun Make: SIG Sauer Color: Black Sight Style: OEM Height Additional Features: U 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 30percent 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 U Rear Pistol Sights Night Fision SIG-176-007-WGWG: Perfect Dot Night Sight Set w/Front U Rear White Front w/Green Tritium White Rear w/Green Tr Fits Sig Sauer .40 S&W & .45 ACP Caliber P-Series