Williams apertures are standard thread size and will accommodate Williams, Redfield and Lyman receiver sights. The Twilight series are designed for shooting under poor light conditions. They create a sharp contrast that gives quick definition to the aperture hole.
Machined from steel
If included in description, the fractional dimension is the outside diameter of the metal aperture.
The decimal dimension is the size of the hole drilled in the aperture which is actually looked through by the shooter.
Apertures are standard thread size and will fit Williams, Lyman and Redfield receiver sights.
The twilight aperture is specifically designed for low-light conditions.
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