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Brush Research GB314320AO FLEX-HONE®, 3-1/4" (83mm) Diameter, 320 Grit, Aluminum Oxide Abrasive (Pack of 1): Amazon.com: Industrial & Scientific
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Flex-Hone® Blog- Brush Research Manufacturing's Company Blog: Dingleberry Hone, Dingle Ball Hone or Flex-Hone
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