All Venev stones use FEPA-F grit classification

but what makes lapping films unique is ultra-fine versions

put a small amount (1-2 drops) of honing oil on the stone’s surface and spread it evenly over the stone with a finger

The grind can be symmetric

Gritomatic Silicon Carbide 2500 Silicon carbide stone set for hard steels (over 58 hRC)

belgian blue whetstone kme bestseller All Venev stones use FEPA-FBelgian Blue Whetstones (BBW) are used for finish or pre finish sharpening on KME or Hapstone knife sharpeners. Belgian Blue Whetstone is mined in the Ardennes mountains in Belgium. BBW is natural slate with a high garnet content. BBW stones are universal, and can be used to sharpen knives of any steel. How to use Belgian Blue Whetstones should be used with water. All that is required is to wet the BBW surface. There is no need to immerse the stone.