Self-guiding cutters for rounding over edges do not require a side fence.
They are supplied with two bearings.
Use the larger bearing for a round-over.
If the cutter is lowered, a top quirk can be produced.
A full round/bullnose for stair treads can also be produced by taking a second pass from the opposite side of the workpiece.
Dimensions:
D=63.5 mm
C=32 mm
B=9.5 mm
B2=12.7 mm
R=25.4 mm
Shank Diameter=1/2 inch
Shank Diameter: 1/2
Diameter Metric: 63.5
Cut Length Metric: 32
Bearing Diameter Metric: 9.5