Opinels and Moras both use the ancient'scandinavian' grind, a single wide bevel as opposed to hollowground, Moran or secondary beveled edges.This, and the thin material of Opinels and Moras make for very sharp, very easy to sharpen blades. Canadian instructor Mors Kochanski goes so far as to use a dime to determine if a blade is thin enough! The tradeoff is an edge that 'rolls' under hard use. This is why a stout blade for heavy billet splitting,digging or hammering is a wise choice for a primary blade when axes,shovels,saws etc. are not carried, hence the Beckers,Fallknivens,Cold Steels et al.