400 grit surface removes steel quickly for fast knife maintenance
High hardness resists flaking and extends stone lifespan
No soaking required for immediate use, saving time and water
Ideal for prepping knives for a kasumi finish and deep scratch removal
Stays flat better than cheaper low grit stones for consistent sharpening
Summarized by Shop
The Naniwa Professional 400 grit stone is hardcore. It eats up steel so fast that it makes serious repairs & bevel-setting a dream. Naniwa Professional stones are harder than most, so they stay flat better and last much longer than cheaper options.
When to use this stone:
Cuts steel quickly and no soaking is required, just splash
Grit
400
Dimensions
210 x 70 x 20 mm
Material
High-hardness abrasive stone
Color
Green
Pattern
Solid
Manufacturer
Naniwa
Summarized by Shop
5.0
23 ratings
5
4
3
2
1
Naniwa 400
Very good quality
J
Joël · February 23, 2026
Worth it
Best stone on the market for repairs
S
Stephen · January 2, 2026
Great stone
This is a great quality stone and is ideal to start your sharpening before moving on to 4000 or 1000.