“I bought a selection of these carbide burrs, all with 1/4" shank, for cutting out some rusty nail heads in planking on my 1956 sailing yacht.
Chucked into a compact plunge router, the radius burr is ideal for making the initial shallow bore. If a substantial nail head remains, I can follow up with an end burr. The plunge router holds the tool securely against the work to allow a controlled cut with minimal skipping.
A slow speed is best to minimize burning the soft wood. The burr teeth soon fill with partially fused wood powder, but still manage to cut acceptably well. A fine brass brush will clean the teeth if necessary, but it's not commonly necessary until final cleanup. At that point a brief soaking in xylene will fully release the debris.
I'm impressed at how easily and completely these burrs clean up. The tooth faces are very finely polished.”