These cove style cutters with two flutes give radiused grooves for decorative panel finishes and board edges.
For deep channels take a series of passes.

Specification:
D=1/2 inch
D=12.7 mm
C=5/16 inch
C=7.9 mm
R=6.3 mm
OL=48.5 mm
Shank Diameter=1/2 inch