The size wheel needed for a hollow grind is determined by the size of stock you are grinding. and that includes thickness of the stock. If you grind a two inch wide piece of steel that is 3/16" of an inch thick with a 8" wheel and you grind to the spine area the belly of the grind will be too thin for use. A ten or twelve inch would be better for that. If you grind smaller width and or smaller thickness steel the eight may be perfect. Order up a set of wheel of all sizes and you are covered...haha Yes I do know what they cost. I use an eight inch for all hollow grinds,,it is what I have and I make knives from the size of stock that works best for it.
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