Naniwa Nagura stone IRODORI
This NANIWA 'Nagura' stone is a small stone intended to help maintain the main stone's surface, to take down high spots and raise sharpening slurry quickly.
Used as one of the popular accessories for finer sharpening stones, this product is the only genuine Nagura stone manufactured and sold by NANIWA.
They develop a high-quality slurry and also serve to flatten high spots on the surface of sharpener.
After dripping water to the whetstone, rub the Nagura (which contains the abrasive).