Wilson Combat^® Nite-Eyes^® Tritium Sights feature a bright green front sight insert and a subdued yellow insert on each side of the rear sight notch. The bright green color draws the shooter's eye to the front sight while the subdued rear yellow dots serve as an instantaneous color-coded alignment check. Nite-Eyes^® low-profile snag-free sights provide a well-defined sight picture, making them the ultimate combat sight under all light conditions. The front 1911 Auto sights are dovetail mounted (.300" x 60degree) for positive sight retention. All sights come in sets: front & rear with Allen head set screw. (Ten-year illumination guarantee on Tritium sights.)