Product DescriptionThe XS SIGHTS Big Dot Revolver Front Sight delivers fast sight acquisition day or night for defensive revolvers. Its tritium lamp is surrounded by a high-visibility yellow Glow Dot that charges from ambient light for outstanding low-light visibility. Built from CNC-machined steel with a durable black finish, this front sight is designed for S&W J-Frame models with a pinned front sight and the Ruger SP101 with fixed rear. Installation requires drilling the pin hole in the sight body. The Big Dot measures 0.188 inches across with an overall sight height of 0.205 inches.Product Highlights High-visibility Big Dot front sight with tritium center and yellow photoluminescent outline Glow Dot technology absorbs ambient light to boost low-light performance Rugged CNC-machined steel construction with black finish Fits S&W J-Frame (pinned front) and Ruger SP101 (fixed rear) revolvers Easy-to-see 0.188 in. dot; overall sight height 0.205 in.; pin hole must be drilled for install Specs Product Type: Tritium front sight for revolvers Fitment: S&W J-Frame with pinned front sight; Ruger SP101 with fixed rear Front Sight Dot Width: 0.188 in Overall Sight Height: 0.205 in Front Color: Green tritium with yellow outline Body Color/Finish: Black Material: CNC-machined steel Mount Type: Pin hole front sight (drilling required) UPC: 647533000604 MPN: RV0003N3Y 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.