Direct replacements for factory sights on popular handguns gather ambient light for superb visibility. The more light, the brighter the rods glow. 3-dot sight picture; front sight has red insert, rear has two green inserts. The Fire Sights for guns originally equipped with fixed sights are also fixed. If the gun was originally equipped with an adjustable rear sight, the Fire Sight will be adjustable. Mfg: Williams Gun Sight