A blade shank that can be used for cutting corrugated sheets incorporating improvements to blade design and cutting geometries for an improved cutting action on corrugated sheets; that may include a handle, but does include a blade shank or blade base, at least one cutting edge, at least one guide member attached to the blade base or blade shank; the blade shank can be attached to a handle with the cutting edge facing rearward while the guide member is directed rearward wile the guide member straddles the cutting edge or edges.
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