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What grit are fine and extra fine diamond stones?

Diamond stones usually come in 180, 300/360, 600 and 1000/1200 grit. The labels correspond roughly to:

Fine: about 600 grit
Extra fine: about 1000/1200 grit

If you will be sharpening plane blades, choose diamond stones that are 210 mm (8") long, so there is room for wider blades and you get an even result.

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