Williams™ Aperture Twilight 3/8" 1440 are designed to be used on Williams™ Redfield and Lyman receiver sights. The Williams™ Aperture Twilight 3/8" 1440 creates a sharp contrast that gives quick definition to the aperture. It is important to note the following when choosing the correct Aperture for your sight:
The fractional dimension is the outside diameter of the metal aperture.
The decimal dimension is the size of the hole drilled in the aperture used to aim.
Twilight apertures are specifically designed for low light situations.
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