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High-performance coarse aluminum oxide stone for roughing work and coarse sharpening on Hapstone Pro sharpeners.
Series
RUBY series stones are made of aluminum oxide and are high-performance stones designed for roughing work.
Grit range
RUBY stones are available only in coarse grain and are used for fast material removal. RUBY 150 grit is in great demand for coarse sharpening.
Format
The narrow format is useful for more focused sharpening work while keeping the standard 6 mm abrasive thickness.
Maintenance
Boride stones may have saw strokes on the working surface, lacquer residues, or small chips at corners and edges no larger than 1 mm.
These minor marks are eliminated during stone preparation. Additional lapping can be performed with loose silicon carbide powder or a diamond lapping plate.
Lubricants
Boride stones can be used with water, soapy water, Boride Bori-Lube, or a water solution of dipropylene glycol. WD-40, refined olive oil, and oleic acid are options for experienced users only.
Preparation
When using water, soak the stone for 1–2 minutes. When using oil, apply 1–2 drops to the surface and spread evenly. If the stone absorbs the honing oil, use a larger amount of oil.
Specifications
