The RV0003N3Y XS Sights Tritium Night Sights provide unparalleled front sight visibility under all lighting conditions. This is achieved through a unique blend of tritium and XS\'s proprietary glow dot technology. By upgrading your home-defense shotgun to our high-contrast front sight, you enable the sight to absorb light and glow during sub-optimal conditions.The optic yellow variant is ideal for low light situations and emits the most intense glow. Primarily based on the white light spectrum, optic yellow is highly reflective and activates the photoluminescent properties of the dot quicker than any other color. Additionally, the expanded surface area of the convex dot enhances light absorption, thereby increasing the glow intensity of the sight dot.Please note, installation of the sight requires the use of a drill press to create the necessary retaining pin hole in the sight body.