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COMBINATION SHARPENING STONES are made of the black silicon-carbide and
green silicon-carbide or the brown aluminum oxide and white aluminum oxide with
the vitrified bond. Combination of one thick-grit-size face for rough grinding
and the other fine-grit-size for finishing has got the advantages of easy carrying
quick sharpening, suitable hardness and long service life. These are able to used
for sharpening of various manual cutting tools.
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