240 600 1500 4000 6000 grit professional knife sharpener sharpening for a knife stone whetstone honing oilstone water oil stones

Link : grit professional knife sharpener sharpening for a knife

More grit to choose, eruitable for all kinds of grinding requirements.

White Corundum sharpening is better and more durable.

Single-side whetstone is more easier to use.