Contrasting colored front sight ring for even faster focus - Quick and accurate U-notch Design - Angled rear sight edge for emergency one-hand operation - All features of our popular TFX Handgun sights - TRUGLO created the original TFO day / night sight then made it virtually indestructible with their hermetically-sealed TFX sights. Now they're taking TFX technology to the next level for professionals and shooters who demand maximum performance from their handguns providing ultimate reliability accuracy and brightness no matter how tough things get.