Primary Color: BlackBullet Features: Adjustable rheostat for brightness Purple LED Includes adapters for most popular sight sizes Adjustable rheostat control sight light with purple LED. The knob control allows you to change brightness from low to high intensity.Reduces pin glare at dawn and dusk. Includes adapters for sizes 1/4″-28, 3/8″-32, 3/8″-36, 7/16″-30 thread sizes.