The **Naniwa Multi Stone 502/510** is a double-sided sharpening stone from the Japanese sharpening specialist Naniwa. This water stone has a coarse side with a grit size of 220 (green), and a medium-fine side with a grit size of 1000 (red). As such, this stone is excellent for restoring the fold of your fairly blunt knife, and then sharpening the edge with the 1000 side.
The Naniwa Multi Stone sharpening stones are relatively soft Japanese sharpening stones, of the quality you can expect from Naniwa. The grinding particles are aluminium oxide. They are the successor to the former Combination Stones and are produced in the same way in Vietnam. Production is strictly controlled by specialists from Japan, who ensure that nothing is lost in terms of quality.
Because the Multi Stones wear out slowly, unused abrasive grains constantly come to the surface. The sharpening stone therefore remains clean. Thanks to the thick grinding layer, these sharpening stones will nevertheless last for many years. For an optimal sharpening result, immerse the Multi Stones in water for a few minutes before use so they are fully soaked through before use.
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