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Naniwa Chocera Pro Sharpening Stone, 400 grit

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Naniwa Chosera Coarse 400 Grit Japanese Whetstone Sharpening Stone,  20cmx7cm surface, 2cm thick. Made in Japan.

This coarse stone is perfect for grinding a new edge on your knife, and for working out nicks or cracks or other imperfections in old used/abused/damaged knives. Use this grade only when you regular maintenance and finishing isn't doing the trick anymore. It's quite coarse and so will cut (remove metal) quite aggressively and quickly.

Note: Naniwa has re-branded these as Chocera Pro (yes, changing the spelling to Chocera with a "c" now) for 2024. The stones are identical, just the branding/name and packaging has changed (again). The packaging is also more eco-friendly, being all cardboard and with no plastic shrink-wrap on the outside.

These stones are widely considered the finest stones money can buy. They are the next generation of the superb Chosera stones, promising even faster cutting. They are artificial stones made with the magnesia bonding method. In terms of hardness they are slightly harder than the Super Stones, and because of the different bonding methods these "feel" harder and cut more quickly. They are very durable and long-lasting, but this extra hardness means that there is also more of a potential for cracking or chipping than with the Super Stones so be sure to air dry them and store in a cool, dry place and do NOT expose them to extremes of heat or cold (NO freezing!) or quick changes in temperature or humidity.

Do NOT soak them, and do NOT leave them soaking in water while you use other stones... in use, just splash more water on the stone as needed instead of prolonged and repeated soakings, otherwise hairline cracks can appear over time.

If you're not a regular user of your stones and only want them for occassional home use, we suggest that you consider the Super Stones or Traditional Stones instead, as they are still very high quality but are more forgiving of the cycle of wet/dry and extreme temperature and humidity changes in our climate. The Pro Stones fare better with regular use and regular lapping to avoid potential problems with cracks forming.

Warranty: 90-day warranty against manufacturing defects.

Customer Reviews

Based on 2 reviews
Michael Robinson
Naniwa 400 pro

This is a good , coarse stone for heavier work. Out of the box it is really thirsty. They recommend NOT soaking it but I soak mine for two minutes or so as it absorbs water quickly if I don’t. Does a fine job and I’ve grinder some very dull blades into shape with it. The grit feels smoother that the Sharon pro 325.

sherri corrigal

Great quality stones and excellent customer service.

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