Agate Whetstone for KME (Mounted)

For Hapstone and KME knife sharpeners (KME format)
$22.00 USD 📊 Grit Chart


Agate Sharpening Stones are used for finishing or pre-finish sharpening knives of soft steels using KME or Hapstone knife sharpener.

Agate stone is preliminary lapped and does not require lapping after purchase.

Agate sharpening stones should be used with honing oil as lubricant. The stone does not absorb oil. 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. Remove the used lubricant with a paper towel.

The stone becomes finer over time. Refresh stone surface with a coarse dressing stone if the surface becomes glazed.

May have slight natural imperfections and a color pattern; this is not a defect.

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.


Agate whetstone is determined as the nephrite in petrography tests. Nephrite is an microgranular aggregate of the calcium, magnesium, and iron-rich amphibole minerals. Agate has fiber crystal structure, very high hardness (6-7 Mohs) and relatively low abrasive properties. Agate can be considered as "rasp-file".

Photos below are made with polarized-light microscope, yellow line is 500 micron long. Click to open high-resolution image.

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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