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| to rathole | |||
| bore up; drill ahead; hole-in; spud (in); tap; tapered tap | |||
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| holing (Schiefer); preboring (Pfahlgründung) | |||
| preliminary drilling; primary drilling; rasp-holing; spudding-in (bis zum Ausgangsgestein) | |||
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| to pre-drill | |||
| hole (Schieferplatte) | |||
| prebore; predrill; rough-bore; rough-drill | |||
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| predrill; rough drilling | |||
| pilot drilling; pre-drilling | |||
| pre-drill | |||
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| pilot drill-bit | |||