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, 3 x 8 in Ceramic, 306UF

Spyderco Ultra Fine Benchstone Sharpening Stone, 3 x 8 in Ceramic, 306UF

Product ID: 7202587

Details

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

📏3x8 inch large surface

🔥3000°F kiln-fired ceramic

🛠️Oil & water-free use

R$2565

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Description

🔪 Sharpen Like a Pro, Anywhere, Anytime!

GRIP GO PORTABILITY - Includes suede sleeve for slip-free sharpening and easy transport—take your edge anywhere.
EFFORTLESS MAINTENANCE - No oils or lubricants needed—dry sharpening simplifies your workflow and cleanup.
PROUDLY MADE IN THE USA - Crafted with synthetic sapphire ceramic for unmatched durability and consistent performance.
SHARPEN BIG SHARPEN BOLD - Generous 3" x 8" surface perfect for large blades, woodworking tools, and even ski edges.
MAXIMIZE YOUR EDGE PRECISION - Ultra-fine ceramic grit delivers a razor-sharp, hair-popping finish for professional-grade tools.

The Spyderco Ultra Fine Benchstone is a premium 3" x 8" ceramic sharpening stone made in the USA, kiln-fired at 3000°F using synthetic sapphire alumina for exceptional hardness (Mohs 9). Designed for dry use without oils or water, it offers an ultra-fine grit surface ideal for large blades, woodworking tools, and ski edges. Lightweight and portable with a suede sleeve for grip, it delivers professional-level edge refinement with minimal fuss.

Specifications

ASIN	B000Z0RW1A
Best Sellers Rank	#580,559 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1,107 in Sharpening Stones
Brand Name	Spyderco
Color	Multicoloured
Customer Reviews	4.5 4.5 out of 5 stars (105)
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 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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R$2565

Duties & taxes included

In stock

Sold byAmazon BrazilDelivered 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 Brazil.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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