| 摘要 |
A nail comprises a plurality of umbrella-shaped threads spirally formed on the shank and extended from the nail end to the head, wherein the umbrella-shaped thread includes a top face and an end edge face, in which the outer diameter of the top face is greater than the outer diameter of the end edge face, such that the nail can be nailed into a planking easily and successfully without the obstacle of the umbrella-shaped threads. While pulling out the nail, an actuating tool is used directly to rotate back the nail, so as to prevent from damaging the surface of the planking and efficiently save the time and labor.
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