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 Ultra Fine Benchstone Sharpening Stone

Spyderco 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 stability & storage

€ 312.88

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Description

🔪 Sharpen Like a Pro, Slice Like a Boss

STAY STABLE SHARPEN SAFELY - Includes a premium suede sleeve that doubles as a non-slip base, ensuring steady sharpening every time.
MAXIMIZE YOUR EDGE PRECISION - Ultra-fine ceramic grit refines blades to a razor-sharp finish for flawless, professional results.
SHARPEN LARGE TOOLS WITH CONFIDENCE - Generous 3" x 8" surface ideal for plane blades, chisels, and woodworking tools—no tool too big.
EFFORTLESS MAINTENANCE ALWAYS READY - Simple cleaning with a scouring pad and abrasive cleaner keeps your stone performing at peak sharpness.
CRAFTED IN THE USA WITH PREMIUM MATERIALS - Made from synthetic sapphire alumina ceramic, kiln-fired at 3000°F for unmatched durability and hardness.

The Spyderco Ultra Fine Benchstone is a professional-grade 3" x 8" ceramic sharpening stone crafted in the USA. Featuring ultra-fine synthetic sapphire alumina ceramic, it delivers a hair-popping edge without the need for lubricants. Its large flat surface is perfect for wide blades and woodworking tools, while the included suede sleeve ensures stable, slip-free sharpening and safe storage. Easy to maintain and built for precision, this benchstone is the ultimate tool for millennial pros who demand flawless edges and lasting performance.

Specifications

ASIN	B000Z0RW1A
Best Sellers Rank	#652,706 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1,234 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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€ 312.88

Duties & taxes included

In stock

Sold byAmazon BelgiumDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Belgium.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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