Crystolon Stones are used for coarse sharpening knives on KME or Hapstone knife sharpeners. Crystolon is one of the oldest sharpening stones in the USA. Crystolon stones are made of oil-treated silicon carbide. All Crystolon stones are 5-6 mm thick.
It is advisable to use Crystolon stones to sharpen knives made of hard stainless or carbon steel. Use of Crystolon stones to sharpen knives made of soft steel is not recommended - use India instead.
Crystolon Stones may be used with oil as a lubricant, or without lubricants at all.