Thanks!
I looked up those ribbed ones, same as StewMac has. Those are 3/8" in diameter (~ 9.5 mm). They will fit in 10 mm holes, although you should use a 3/8" bit.
The ones I have are 10.5 mm and do not fit in 10 mm holes. I tested it to be sure, but the outcome wasn't a surprise.
As brad point drill bits, as well as forstner bits go per mm, you don't have 10.5 mm bits. There are 11 mm bits, but not as a brad point (less precise ones are available, those single blades, don't know how you call them). I want a snug fit, so maybe I need some kind of imperial size.
I will visit the hobby store to look for a solution.