What grit is this stone?

As a disclaimer, I do proclaim this to be absolute. What I understood was that the stone, as it is ceramic is measured in microns. This stone I saw advertised as 3 micron which converts to 8,000 grit. I have included a link to share with you the conversion table. https://www.gessweincanada.com/category-s/11328.htm

How does this stone compare to Black Arkansas stone ?

I suspect it is as fine or finer than a hard Arkansas stone. I love mine. I still use a leather strop for the final honing which is probably overkill based on how fine the spider stone is.

Will this stone work on my Japanese knives at 62 rockwell?

I use this for my straight razor

So, I see some say it isn't perfectly flat and they use different methods coarse DMT, etc. to flatten it, so won't that "rough" it up too much?

I had the same concern as you so did not use a dmt diamond to grind the ceramic flat. The many tiny hills and valleys on the ceramic surface are very apparent after sharpening a knife because the tops of the hills get dirty but the valleys do not. But even without being perfectly flat the ceramic works well. It would be nice to do a side by side test to see if flattening the ceramic gives a sharper edge or not.

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Spyderco Bench Stone Smart Knife Sharpener Outdoor Knife Sharpener & Stone Knife Sharpener with Leather Case (White)

Product ID: 263587703

Details

Brand
Spyderco
Colour
White
Item weight
1.18 Pounds
Material
Stone
Product dimensions
5.1L x 2.5W x

👜Leather case doubles as non-slip base

📏Extra-large 12.7 cm length for wide blades

🪨Ultra-fine ceramic grit 9 Mohs hardness

214302CFA

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Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🪓 Sharpen Like a Pro, Anywhere You Go!

SLIP FREE STABILITY - Innovative leather case doubles as a non-slip surface, ensuring safe, steady sharpening on any tabletop.
ON THE GO SHARPENING - Thin, lightweight design fits comfortably in hand for mobile, precise sharpening wherever you need it.
PRECISION EDGE MASTERY - Ultra-fine synthetic sapphire ceramic delivers a razor-sharp, hair-popping finish for pro-level cutting performance.
PROUDLY MADE IN THE USA - Crafted with premium materials and expert care, this sharpener is built to last and impress.
VERSATILE SIZE MAXIMUM REACH - Extra-large stone sharpens everything from large knives to woodworking tools and even ski edges with ease.

The Spyderco Ultra Fine Bench Stone is a premium, ultra-fine ceramic sharpening stone made in the USA, designed for large knives and tools. Measuring 12.7 cm long and crafted from synthetic sapphire-grade alumina ceramic (Mohs hardness 9), it polishes edges to extreme sharpness without needing lubricants. Its thin, lightweight form allows handheld use, while the included leather case doubles as a non-slip base for tabletop sharpening. Ideal for professionals and enthusiasts seeking precision and durability in one sleek package.

Specifications

ASIN	B000Z0RW1A
Brand Name	Spyderco
Color	White
Customer Reviews	4.6 4.6 out of 5 stars (99)
Global Trade Identification Number	00716104640447
Grit Type	Ultra Fine
Included Components	STONE AND SLEEVE
Item Dimensions L x W x H	5.1L x 2.5W x 12.7H centimeters
Item Type Name	Spyderco Ultra Fine Bench Stone with Leather Case - White
Item Weight	1.18 Pounds
Manufacturer	Spyderco
Manufacturer Part Number	306UF
Material Type	Stone
Model Number	306UF
Number of Items	1
UPC	716104640447 000000120609

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TrustScore 4.5 | 7,300+ reviews

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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