Williams Gun Sight Company Twilight Aperture TW-1/2"x.093" | 1441 Twilight apertures are designed for shooting under poor light conditions, early morning, late evening, and other inclement conditions. They create a sharp contrast that gives quick definition to the aperture hole, and they eliminate the “fuzz” with which many shooters have trouble. These apertures are perhaps the greatest development in metallic sights in the last three decades – positive sighting when the light is poor but the hunting best. Williams ‘Twilight' apertures use a standard thread and will accommodate Redfield, Lyman, and other companies' standard thread peep sights. Image is a stock photo, which shows the quality of construction and the general appearance of Williams Sights. The actual item for sale may differ in appearance to provide the proper fit and function. Note: Williams WGRS sights will require a Long Shank aperture. Please order accordingly. Made In U.S.A.