Some Ovolo cutters can be used with radius cutters to make rule joints.
Ref. 7/01 has an extra long shank of 40mm.

Specification:
D=3/8 inch
D=9.5 mm
D2=3.2 mm
C=9 mm
R=2.5 mm
OL=49 mm
Shank Diameter=1/4 inch