What's the highest grit that one uses to finish off sanding an oak floor?
The rental guy said that 120 grit is the highest that people normally go,
and that beyond that there's not "teeth" for the polyurethane. They don't
carry sandpaper for the sanders beyond 120. Hey said Norton didn't make it
any higher (6", no holes).

I just took the floors to 120 ,and they look decent, but I think I'd like
something even smoother.

Appreciate any input.