Sharpening Stone, Blade, Center Hole: 7/8", Diameter: 12", Grit: 30, Material: Ruby, Web Notes: New 30 grit 12" ruby sharpening blade stone. Ruby abrasive stones are made from sintered crystals of, Web Notes: synthetic ruby. They are extremely hard, maintain their shape well and are resistant to wear., Web Notes: Because they are so hard they can sharpen and finish extremely hard metals The blade width is 1", : with 7/8" center hole.
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