Product DescriptionXS Sights DXT2 PRO Series Big Dot Night Sights deliver exceptional front sight visibility with a rugged Black Nitride finish and upgraded tritium lamps. The large green Big Dot front sight features a convex photoluminescent glow dot that charges in light and glows in low-light conditions before the tritium becomes visible. Paired with a low-profile Vnotch rear that uses a tritium vertical bar, the simple dotthe"i" sight picture speeds alignment and helps prevent confusion between front and rear sights under stress. CNCmachined steel construction and an aluminumsleeved tritium insert add durability. Fits Glock models 20, 21, 40, and 41 (standard and MOS). Installation note: do not use a sight press/pusher tool.Product Highlights Large 0.188" green Big Dot front with glow dot and tritium for fast acquisition Lowprofile Vnotch rear with tritium vertical stripe for dotthe"i" alignment Black Nitride finish for enhanced corrosion resistance and durability CNCmachined steel with aluminumsleeved tritium insert for rugged performance Designed for Glock 20/21/40/41 pistols; standard and MOS configurations Specs Product Type: Handgun night sight set Series/Model: DXT2 PRO Big Dot Front Sight Outside Diameter: 0.188 inch Front/Rear Illumination: Tritium (green); photoluminescent glow dot on front Rear Profile: Lowprofile Vnotch with tritium vertical bar Finish: Black Nitride Material: CNCmachined steel Dovetail Cut: Glock Compatibility: Glock 20, 21, 40, 41 (standard and MOS) Country of Manufacture: United States of America UPC: 647533001106 Manufacturer Part Number: GL-X203S-5G 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.