XS Sight Systems R3D Night Sights. The anti-reflective rear tritium lens reduces glare and the sights are constructed from durable CNC machined steel. Specifications for XS Sight Systems R3D Night Sights: Manufacturer: XS Sight Systems Color: Black Features of XS Sight Systems R3D Night Sights: Tritium-powered front sight with photoluminescent Glow Dot for low-light conditions High-contrast sight Anti-reflective rear tritium lens CNC-machined steel construction Fits Kimber K6 revolvers except K6xS models Designed for .38 Special and .357 Magnum calibers Gunsmith installation recommended. Package Contents: XS Sight Systems R3D Night Sights