Busch & Co have developed the special twist drill 203HM to set drillings for uptakes of retaining or positioning pins for attachments.
The twist drill is made out of finest grain carbide. The new design of the carbide twist drill improves the discharge of chips and allows holes to be drilled accurately in a large variety of alloys, including those which are difficult to cut, the manufacturers claim.
The drills are available in four different diameters with a short handpiece shank (34 mm) for cutting.
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Drill with a twist. Br Dent J 197, 769 (2004). https://doi.org/10.1038/sj.bdj.4812001
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DOI: https://doi.org/10.1038/sj.bdj.4812001