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, Semi-Buckhorn or Full Buckhorn Uprights.
SPECS: Dovetail Model - Total heights: #63 and 64, .275"
(7.1mm) - .505" (12.4mm); #63H, 64H, 66H and 67H, .350"
(9.0mm) - .630 (16.0mm); #65, 66, 67 and 68, .300" (7.6mm)
-.510" (12.9mm).
Catalog page 268