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Ruby Ceramic Stone 6" x 1"



Abrasive Sintered ruby ceramic
Available Grits 📊 Grit Chart Estimated
3000 JIS EF
Bonding No bonding
Country of Origin China
Extra Material Mounted on aluminum blank
Form Factor Edge Pro
glgc 3k
Lubricant Oil or WD-40
Thickness of Abrasive 5-6 mm
Total Thickness 9 mm
Working Surface 152 x 25 mm (6" x 1")


Ruby Ceramic Sharpening Stones are used for finishing sharpening knives using Edge Pro compatible knife sharpeners (Hapstone, TSProf, etc). The stone has an extremely high hardness rating.

Ruby Ceramic scarcely wears over time. Extra-fine ceramic stones provide a super finish for the cutting edge.


  • Product size: 160 x 25 x 9 mm (6" x 1" x ⅓")
  • Working surface: 150 x 25 x 6 mm (6" x 1" x ¼")
  • Weight: 70 g (2.5 oz)
  • Abrasive: Alumina Ceramic
  • Extra materials: Aluminum Blank, 3M PSA

How to use

Ruby Ceramic stones can be used without lubricants. Alternatively, oil or water can be used as lubricant.

Ruby Ceramic stones do not have any minor defects.

Ruby Ceramic stones do not require any preparations. It is naturally lapped to ultra-fine grit. This is a big advantage because the difficulty of lapping Ceramic is very high.