| 摘要 |
A fastener is provided to facilitate assembling and disassembling works by reducing turning trace of the fastener. A fastener(30) comprises a head portion(31), a coupling portion(32) and a plurality of coupling ribs. The coupling portion is formed in a cylindrical shape. The coupling ribs, including one or more coupling protrusions, are extended in the circumferential direction and elastically supported on the outer surface of the coupling portion.
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