60\ Shoulder x .359"
Universal Sight Base Cutter made for sights with 60°
shoulder and a 3/8" base. Cuts most standard front and rear rifle
sights as well as 1911 Auto low-mount, adjustable sights like
E.E.A. Super Sights, Millett and current Bo-Mar. Cutter is slightly
undersized at .359" which requires that you make two cutting
passes to compensate for factory variations in sight manufacture
and milling tolerances. Designed with proper relief for maximum
strength and clean cutting. CAUTION: For use in milling
machine only. 2" (5cm) long. 3⁄8" (9.5mm) diameter shank. 60° shoulder. DO NOT EXCEED 700 rpm, HIGHER SPEED WILL BREAK TEETH.
1911, Issue:09, Page:061
Big Book Catalog, Issue:66, Page:147
Big Book Catalog, Issue:66, Page:500