CERAMIC STONES Our ceramic stones will not cup & require no lubricants, perfect for sharpening whittling & chip-carving knives which require a perfectly flat cutting edge, plus carving gouges & chisels. The secret? 94% aluminum oxide, the 2nd hardest naturally occurring composition. Black stones are for medium to coarse cutting, initial shaping & sharpening. Stones include non-slip box & instructions. Black Medium=600 grit. 1/2x2x8". 588001
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