Trijicon CA110-C-600816 Colt HD Night Sight Set, Combat Commander, Yellow Front Outline Lamp HIGH VISIBILITY COLORED FRONT SIGHT POST: Glow-in-the-dark photoluminescent paint aids visibility and quicker target acquisition in transitional light SUBDUED REAR SIGHT: Angled and serrated surface to reduce glare, and black painted rings to enhance focus on front sight "U" NOTCH REAR SIGHT: Specifically designed rear notch enhances front sight acquisition TRITIUM-PHOSPHOR LAMP: Tritium-filled glass lamp provides superior illumination in no light or low light settings FITS: Colt Combat Commander and stake-in front Para Ordnance P13 (excluding Limited version). The front sight tenon size measures 1/8 of an inch