I think he meant .5 CrOx, as in .5 Chrome

I learned to hone on a barber hone. They are short usually, requiring more strokes and thus cut slower, and they rarely overhone, ever.

Now if you could find a slow hone and prevent it from ever overhoning you'd be buying that hone up in spades to teach guys how to hone. Or you'd be buying barber hones and realizing that you're doing the same thing . . . mmmmmmmmmm

Double bevels are particularly neat with barber hones because you don't have lesser grit to remove, only the grit applied at the secondary bevel geometry.