All sets feature a bright red, fiber optic, front sight and fully adjustable peep or U-notch, rear sight. U-notch, rear sight sets use the highly accurate, 3-dot pattern with two green, fiber optic dots at the rear for sharp contrast and quick sight acquisition in all light conditions. No drilling or tapping required for most rifle models. Dovetailed front and rear sights may require minor fitting. For Marlin and Winchester lever action rifles. Dovetail replaces factory front and rear sights. Rear sight is screw adjustable for elevation and drift adjustable for windage; has two, green, fiber optic dots. Front has red, fiber optic rod.