| 摘要 |
PROBLEM TO BE SOLVED: To provide a nail comprising a head and a trunk in which at least one groove is formed in the axial direction of the trunk, provided with protrusions of lower heights each lower than the depth of the groove in the groove for achieving the prevention of coming off after the nail is driven, which can be safely driven. SOLUTION: The nail 1 comprises the head 2 and the trunk 3. At least one groove 4 is formed in the axial direction of the trunk 3. The protrusions 5 of lower heights each lower than the depth of the groove 4 are formed in the groove 4. COPYRIGHT: (C)2004,JPO
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