Used for trimming plastic or plywood overlays.
Also for copy profiling with a template.

Specification:
D=5/8 inch
D=15.9 mm
C=5/8 inch
C=15.9 mm
OL=2 41/64 inch
OL=67.5 mm
B=15.9 mm
A=90 degrees
Shank Diameter=1/4 inch