This is a custom made 3pc set for the Williams Aperture/Diopter Sight. This is NOT for the sight. The set includes a 1” extension, rubber eyeshade, and a iris reducer. The reducer has a 1/32” hole, as the the factory has a 3/32”. See both in pictures. It just presses in the existing aperture. The 3 piece set is $20 plus $7 shipping. Continental U.S Only. Just pm me if interested. Thank you. 
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