Dick says...

I got a set from H/F on sale for 8 or 9 dollars and find that the 2 x
6" size are plenty large enough to use on anything I would want to sharpen.
I have found that the finest grit size is way to coarse to sharpen anything
other than maybe an ax.

2 x 6 isn't big enough for a card scraper. Gets cramped with a honing
guide too. I thought the same thing about the grit numbers. That is
three super coarse grits good only for removing nicks or changing a
bevel angle.