Boride sharpeners of the Golden Star EDM series are excellent stones made of alumina with strict control of granularity. The set includes 5 stones with a grain size: 150; 220; 400; 600; 1000, which will be enough for all stages of sharpening, from peeling to the final grinding. And the smooth reduction of grain, from stone to stone, guarantees efficient sharpening with minimal time.
The Golden Star EDM series are special stones designed for work on medium hardness steels. Due to its high productivity, this series in the Boride line of stones is recognized as the best for sharpening carbon steel knives.
Abrasives of this series do not require pre-soaking, but, despite this, the manufacturer recommends that you use them with branded oil for sharpening (or its analogue).
This set of stones does not require special care. Cleaned under running water with a soapy stiff brush (can be a toothbrush). Align after formation on silicon carbide.
Note: Boride stones can have the following defects: traces of a saw on a working surface, insignificant chips on corners and edges (the size no more than 1 mm).