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Twist Drill Bit

  • Used in both wood and unhardened metals to make clearance holes for bolts, screws, etc., and to make holes for tapping.
  • Bits marked HS (high speed) or HSS (high speed steel) are suitable for drilling in metals or wood,
  • Bits made of carbon steel should be used only in wood and not in metal as they are more brittle and less flexible than HSS bits.
 

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