Oboro Knife


With fewer and fewer opportunities for sharpeners to use natural stones, OBORO TOOL was created after more than 18 months of development as an alternative to Natural Stone.
OBORO TOOL is called "natural windstone" because it is made of diamonds and stones mixed with substances found in natural stones. Therefore, just as natural stones do not have a definite grain size, OBORO TOOL , like natural stones, is divided into Chuto-Koma, Chu-Shiage, Shiage, and other grain size levels.
OBORO TOOL works well mainly with Japanese single bevel tools (Kanna planes, Nomi Chisels, etc.).



Product Type Diamond Sharpening Stone
Brand NSK Kogyo Ltd.
L 200mm x W 75mm x 26mm
Abrasive Thickness
3.5mm +

Any type of kitchen knife sharpening & steel
Best suited for carbon steel Honyaki & clad

Grit #200, 400, 800, 2000, 4000, 6000

Take 1-3 Months+ to be Delivered for This Handmade Stone

NSK Kogyo's products are individually handcrafted by skilled craftsmen to produce the best diamond sharpening stones. All work is done by a single craftsman with the skills and knowledge he gained at the Japanese sharpening stone manufacturer where he worked for many years, requiring a lot of time to produce the products.
Currently, back orders are coming in from all over the world, not just Japan, so it is taking time to manufacture. If you wish to order, please place your order in Pre-Order.

We guarantee that you will receive the best diamond sharpening stone for your waiting.