| 摘要 |
A tapping tool comprises a threaded portion and an upper gripping shank, and presents an axial bore which has its base wall proximate to the end of said threaded portion and opens at the end of said shank, there being present in proximity to said base wall at least one duct which connects said bore to the outer surface of said threaded portion, and makes available on one side of the outer rim of said duct a sharp edge for removing the material, which then by passing through said duct collects inside said bore.
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