60\ Shoulder x .245"
We’ve had many requests for a small dovetail cutter that would speed up the cutting of dovetails in front sight blades when installing colored inserts. The one we’ve had made cuts a 1⁄4" wide dovetail, just right for sight inserts, and the finished product is very precise. Since the cutter is small, (it tapers to a diameter of .110"), you must make an initial cut with a 1⁄8" end mill (listed below). By using the end mill to remove some metal first, you'll avoid overloading the cutter and breaking it. CAUTION: For use in milling machine only. Solid carbide 2" (5cm) long. 1⁄4" (6.3cm) diameter shank. 60° shoulder.
1911, Issue:09, Page:061
Big Book Catalog, Issue:65, Page:138
Big Book Catalog, Issue:65, Page:492