| 摘要 |
The boring bit (1) is provided for arranging in an opening (3) provided in a bit support (2) of a drilling tool. It is provided with a centring and driving groove (4), which can be brought into engagement with a centring and driving pin (5), arranged in the bit support (2), for torque transfer and centring of the boring bit (1). In order to be able to use the same boring bit (1) for different boring diameters, the centring and driving groove (4) is arranged in an adjustable displacing part (12). <IMAGE>
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