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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Ultra Fine Benchstone Sharpening Stone

Product ID: 7202587

Details

Brand
Spyderco
Color
Multicoloured
Grit Type
Fine Grit
Item Highlight
Ceramic Stone
Item Weight
1.2 pounds
Manufacturer
Spyderco

📏3" x 8" large sharpening surface

⚙️Ultra-fine ceramic for precision edges

🛡️Non-skid suede sleeve for stable use

3537 kr

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Sold byAmazon NorwayDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔪 Sharpen Like a Pro, Stay Ahead of the Pack

STABLE SECURE SHARPENING - Includes a suede sleeve that doubles as a non-skid pad, ensuring slip-free, safe sharpening.
MAXIMIZE YOUR EDGE PRECISION - Ultra-fine ceramic grit refines blades to a razor-sharp finish for professional-grade cutting.
SHARPEN LARGE TOOLS WITH EASE - Generous 3" x 8" flat surface ideal for plane blades, drawknives, and woodworking tools.
EFFORTLESS MAINTENANCE ALWAYS READY - Simple cleaning with scouring pad and abrasive cleaner keeps your stone performing at peak.
CRAFTED IN THE USA FOR QUALITY DURABILITY - High-grade alumina ceramic fired at 3000°F delivers unmatched hardness and longevity.

The Spyderco Ultra Fine Benchstone is a premium 3" x 8" ceramic sharpening stone designed for professionals and serious hobbyists. Made in the USA from alumina ceramic (synthetic sapphire), it offers an ultra-fine abrasive surface that sharpens large blades and woodworking tools to a precise, hair-popping edge without the need for lubricants. Its included suede sleeve provides a stable, non-slip base and secure storage, while easy cleaning ensures long-lasting performance. Perfect for those who demand the ultimate edge refinement before stropping.

Specifications

ASIN	B000Z0RW1A
Best Sellers Rank	#439,743 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #839 in Sharpening Stones
Brand Name	Spyderco
Color	Multicoloured
Customer Reviews	4.5 4.5 out of 5 stars (104)
Global Trade Identification Number	00716104640447
Grit Type	Fine Grit,Ultra
Included Components	STONE AND SLEEVE
Item Dimensions L x W x H	8"L x 3"W x 0.31"H
Item Highlight	Ceramic Stone, Professional Grade, Suede Carrying Case
Item Type Name	Benchstone Ultra Fine 3" X 8"
Item Weight	1.2 pounds
Manufacturer	Spyderco
Manufacturer Part Number	306UF
Manufacturer Warranty Description	SEE MANUFACTURER
Material Type	Ceramic
Model Number	306UF
Number of Items	1
Number of Packs	1
UPC	716104640447 000000120609

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