| 摘要 |
In a screw (1) for fastening wooden laths (10) to a roof substructure provided with wooden beams (9) among other alternatives, one threaded portion (2, 3) each adjoining the head (5) of the screw and adjoining a penetrating or boring point (6) is provided, these two threaded portions (2, 3) having the same major diameter. A thread-free shank portion (4) is provided between the two threaded portions (2, 3).
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