One blade.
Blades can be rotated in 90 degree increments, giving three new edges.
Ref. RT/80 is specifically designed for CNC machines.
Dimensions:
D=17 mm
C=8 mm
OL=49.5 mm
A=45 degrees
Shank Diameter=1/4 inch
Shank Diameter: 1/4
Diameter Metric: 17
Cut Length Metric: 8
Overall Length Metric: 49.5
Angle: 45