Opinel's simple sharpening solution. This 4 inch natural sharpening stone is from the Lombardy region of Italy. Sharpen at a 20 degree angle and use wet. Natural sharpening stone From Lombardi, Italy. The quarries of Lombardi are know to produce some of the world best natural sharpening stones. The natural Lombardi stone has been recognized since the 15th century for its outstanding sharpening qualities due to its perfect, uniform balance of quartz and carbonates. Use with water. 4" x 15/16 x 3/16
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