I've never seen one that small either, 1/8" is the smallest I have. My go-to supplier goes down to 2.5mm, 3/32". But they do have this interesting new "arris rounding" bit down to 1.5mm:Maybe use the 1/32nd roundover bit first, then go up to the 1/16th to reduce the chances of tearout. I was thinking when I read the topic it was a joke. Wow, I can't believe a bit that small is made. Maybe good for hard or exotic woods that may not sand well????
Like a round-over, but with a very slight chamfer on either side of the curve so that the corner of the bit can't dig in and leave a line. I'm guessing it's aimed at production scenarios where it would save time compared to sanding.