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Diamond internal points are used for jig, internal grinding, and precision grinding of small holes in carbide, ceramics, sapphire, glass etc.
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CBN internal points are used similarly on tough, high carbon, high chrome harden steels.
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Grit size in the above table is standard for that item, others are available upon request
https://www.besdia.com/en/product/diamond-and-cbn-internal-points
