XS Big Dot Tritium Front Sights are the finest sights made for fast sight acquisition in all light conditions. Green tritium inserts surrounded by a white outline to improve your sight picture in all conditions. Day-Light, Half-Light, or Low-Light. Fast, simple and effective. This is the ultimate self defense sight system that provides sights you can see around the clock. S&W Airlite Ti replaces pinned front sight on fixed sight guns, requires drilling for pin. Features: - Enhances sight acquisition in all light conditions - Excels in high stress defensive situations - Improves Low-Light accuracy - Low profile, snag free design Specifications: - Front Sight Only - Fits: Smith & Wesson J-Frame, Ruger SP101 - Gunsmithing Required - Front Sight: Big Dot Tritium - Diameter: 0.188" - Material: Blued Steel - Finish: Matte Black - Includes: Front Sight Installation Kit.