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DMT FWCX 1 inch x 4 inch Coarse & Extra Coarse Diafold Diamond... DMT MORE INFO

From the Manufacturer A handy 4-1/3-inch by 7/8-inch two-grit diamond sharpening stone. Unique folding handles close around the stone to form a protective storage sheath. Color coded blue stone is coarse grit or 325 mesh, opposite side is black or 220 mesh. Will quickly sharpen the toughest steel and even carbide knives and tools. Unique interrupted surface speeds sharpening by clearing away the metal particles removed from the tool edge thus enhancing the abrasive action of the diamond crystals. Customer satisfaction guaranteed.