For template work.
Blade can be rotated 180 degree to give double the life of a conventional tool.
Cutter diameter of 19.1mm and bearing diameter of 19.05mm.
Spare blade for Ref. RT/70 from January 2013 is ref RB/T (three hole).
Ref. RT/70 has single flute.
Ref. RT/72 has two flutes.

Specification:
D=1 31/32 inch
D=19.1 mm
C=3/4 inch
C=49.5 mm
B=19.1 mm
OL=100 mm
A=90 degrees
Shank Diameter=1/2 inch
Spare blade 2 hole=RB/B
Spare blade 3 hole=RB/T