The **Kai Seki Magoroku 4000 grit** is a high-quality Japanese sharpening stone to give your knives their razor-sharp edge back, and to maintain this sharp edge. The sharpening stone is made from aluminium oxide with a J4000 grit size. It's the perfect grit size to get already sharp knives back to razor-sharpness.

## Plastic storage box

This sharpening stone comes in a plastic box that also serves as a sharpening stone holder. This way, you can safely store the sharpening stone in your kitchen cabinet, and use it as a base when you're sharpening.

## How to use the Kai Seki Magoroku sharpening stones

Submerge the stone in water a couple of minutes before use. It is important that the surface of the stone stays wet during use. This enhances the sharpening result and extends the lifespan of the sharpening stone. [Read more about sharpening on a sharpening stone here](/en/ct/video-manual-sharpening-on-a-whetstone.htm).

After use, it's important to dry the sharpening stones thoroughly and then allow them to dry fully at room temperature. Don't place the sharpening stone on a heater or in the sun! This can cause the sharpening stone to crack. Once dried, store them in a dry, dark place.

It is normal and expected that a sharpening stone will wear and become slightly hollow after extended use. In order to keep the surface of your sharpening stone flat, we recommend the [Kai Seki Magoroku Flattening Stone](/en/pt/-kai-seki-magoroku-flattening-stone-ap-0335.htm).

Kai Seki Magoroku AP-0332 sharpening stone, 4000 grit

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Kai Seki Magoroku AP-0331 sharpening stone, 2000 grit

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Kai Seki Magoroku AP-0333 sharpening stone 8000 grit

Kai Seki Magoroku AP-0334 double-sided sharpening stone, 1000/4000 grit

Kai Seki Magoroku Flattening Stone AP-0335

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Almost all the products we sell come with a manufacturing warranty. Want to learn more about the warranty? Read our topic: [warranty explained](/en/ct/warranty-explained.htm)

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The country of origin is the country the product is produced, as far as we know. This may differ from the country where the brand itself is located.

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The material that gives the sharpening stone its abrasive effect. Diamond, ceramics (e.g. aluminium oxide or silicon carbide) or the materials in a natural stone. Read [more about the advantages and disadvantages of these materials](/en/ct/sharpening-stone-materials-which-are-the-best.htm).

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The grain size a supplier gives to its sharpening stones. Please note: This can be either in FEPA-F (European), ANSI (American) or JIS (Japanese). Read [more about the different grain sizes here](/en/ct/expressing-grain-sizes-sharpening-stones.htm).

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Sharpening guides help you maintain the right angle when sharpening your knives. [Read more about using sharpening guides here](/en/ct/use-of-sharpening-guides-on-whetstones.htm).

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Some sharpening stones need to be submerged, others only need a splash of water and some need no water at all! For the best results, check in advance what is best for your sharpening stone.

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The grain size we give to a sharpening stone. We test all sharpening stones ourselves and add an appropriate grain size on the basis of this test. From extra coarse to ultra fine.

Kai Seki Magoroku AP-0332 sharpening stone, 4000 grit