| 摘要 |
The invention relates to a roller bit for deep bores, having an essentially coaxial basic body (1) on which lateral arms (2) are arranged which carry taper rollers (3) projecting to the inside. According to the invention, the roller bit consists of separately produced basic body (1), arms (2), bit rollers (3) and spray nozzle unit (4), which can be produced and exchanged separately from one another. <IMAGE>
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