ATOMA Diamond 1/4 size Convex Whetstone #400, Rough Grit (medium range)
Size: 4 1/2 inch X 1 1/2inch X 1 3/4 inch (115mmX35mmX45mm)
Weight: 4oz.
It is not flat surface. It is slightly rounded convex surface.
It might be great sharpening stone to sharpen hollow ground shaped surface or sickle shaped blade.
It is 1/4 size ATOMA rough grit (medium range) stone.
It might confuse #400 and medium range, but ATOMA has #140, #400, #600, and #1200, so #400 is the second range from the lowest grit (#140).
ATOMA #400 Diamond stone is still pretty agressive sharpening power.
It is small size, so it is great to carry outside work for sanding and sharpening.
****After used the Atoma Diamond whetstone, we should rinse slurry well, and dry it. It prevents the rust of the Atoma Diamond whetstone*****