The MEPRO Hyper-Bright fixed Day and Night Sights offer the most reliable illumination for day or night. Mepro Hyper-Bright fixed sights feature an extremely bright fluorescent contrast colored ring for fast target acquisition in the daytime. These self-illuminated, fixed tritium sights feature an extremely bright colored ring front sight in your choice of green, yellow, or orange, delivering supreme visibility as a night sight or day-night sight. Contrasting front and rear sight colors help shooters focus on the front sight quicker for faster target acquisition in all lighting conditions. Premium grade green Swiss-made Tritium vials in the front and rear sights allow for low light and nighttime conditions. Front Sight Length: 0.50". Front Sight Width: 0.14". Front Sight Height: 0.22". Rear Sight Length: 0.91". Rear Sight Width: 0.79". Rear Sight Height: 0.39".