Spyderco Bench Stone 306UF, Ultra Fine

This Spyderco Bench Stone is flat, thin and extra fine for an extremely sharp result. All kinds of tools can be sharpened with it. From knives to chisels and many other tools. The stone is made of aluminum-oxide (synthetic sapphire). On the Mohs-scale this stone has a hardness of 9.2. In comparison, diamond has a hardness of 10!

You don’t need water or oil to sharpen on it. It can be cleaned safely inside a dishwasher or autoclave, but washing it by hand with a scouring pad will also do the trick.

In terms of grit size the Spyderco Ultra Fine goes to 3 microns, 2000 grit in the US, and 4000 grit in Japan.

The stone comes with a leather storage pouch.