Zirconia Ceramic Stone for KME (Mounted)

For KME and Hapstone knife sharpeners (KME format)
$52.00 USD 📊 Grit Chart


Zirconia Ceramic Stones are used for sharpening knives on KME and Hapstone knife sharpeners. Zirconia stones are made of Alumina-Zirconia ceramic with an extremely high hardness rating (over 9 Mohs) and estimated grit approximately 5000 JIS.

Alumina-Zirconia Ceramic scarcely wears over time. The material is used for manufacturing ceramic ball-bearings, dental crowns, and lapping plates for computer chips.

Zirconia Ceramic is preliminarily lapped and does not require lapping after purchase. Zirconia Ceramic stones should be used with oil as a lubricant (oleic acid, WD-40, refined olive oil).

Alumina-Zirconia has the density 4.00-4.05, compared to the standard Alumina density 3.70-3.75. The increased density gives the ability to make extra lapping if necessary.

Advantages of aluminum blanks

  • If you accidentally drop the stone, it's less likely you break it;
  • Much longer life span for the stone after multiple flattening and lapping;
  • Easy identification due to laser engraving;
  • Reliable clamping for stones of imperfect shape.

Stones mounted on aluminum blanks are thicker than stock KME stones. We recommend using the thickness compensator if you use stones of different thickness.

Watch KnifeKrazy YouTube review of the new form-factor.

About Gritomatic

Gritomatic is not just an online shop. This private brand is a collection of high-quality, custom-made sharpening products. Gritomatic offers natural and synthetic stones, empty blanks and leather.

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