Product DescriptionUpgrade your defensive revolver with the XS Sights Standard Dot Tritium Front Sight. Built from CNCmachined steel with a black frame, this sight pairs a green tritium lamp with a photoluminescent green Glow Dot for high visibility in daylight, low light, and darkness. The large, convex Standard Dot (0.140" OD) is intentionally easy to see under stress, aiding shooters with aging or deteriorating vision. Predrilled and supplied with a new retaining pin and thread locker, it is designed to fit Smith & Wesson JFrame revolvers with a pinned front sight and Ruger SP101 models with fixed rear sights.Product Highlights Standard Dot tritium front sight with bright green Glow Dot for day and night visibility CNCmachined steel construction with durable black frame 0.140" outside diameter dot balances visibility with target coverage Predrilled; includes retaining pin and thread locker (gunsmith installation recommended) Compatible with S&W JFrame (pinned front) and Ruger SP101 (fixed rear) Specs Type: Standard Dot Tritium Front Sight Dot/Outline Color: Green tritium with green photoluminescent outline Frame Color: Black Dot Outside Diameter: 0.140 inches Material: CNCmachined steel with tritium lamp and Glow Dot Compatibility: Smith & Wesson JFrame (pinned front); Ruger SP101 (fixed rear) Included: Retaining pin and thread locker UPC: 647533000611 Manufacturer Part Number: RV0003N4G Brand: XS SIGHTS Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&&';;s manufacturer.