This double ribbed ovolo style is an alternative to the rounding over cutter. If the cutter is lowered a top quirk can be produced.

Specification:
D=34.7 mm
C=11/16 inch
C=17.5 mm
B=9.5 mm
B2=12.7 mm
R=5.5 mm
R2=5.5 mm
OL=69 mm
Shank Diameter=1/4 inch