| 摘要 |
A core drill bit (1) for working brittle material has an axially extending tubular shaft (2) with a rotation driver (4) coaxially fitted to a trailing end portion (3a) and a plurality of had material inserts (5a, 5b) arranged on the opposite open leading end portion (3b), which are formed with a defined cutting edge, whereby each individual hard material insert (5a, 5b) is fitted on precisely one intermediate carrier members (6a, 6b) associated therewith, which is fitted on the leading open end portion (3b) of the tubular shaft (2).
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