Sporting Rear Sight Base with three styles of Uprights. Perfect as replacement sights for customizing the sight picture, or adding adjustment to fixed sight guns. Fits standard 3/8" dovetails; available with Flat Top Uprights.
Big Book Catalog, Issue:73, Page:313
SPECS: Dovetail Model - Total heights: #66 .300" (7.6mm) -.510" (12.9mm).