| 摘要 |
A wrench head includes a first end having a drive portion for driving a fastener. A second end of the wrench head includes a star polygonal hole that is a treble square hole having twelve angled portions. Each angled portion includes two sidewalls meeting at a common line. The respective sidewall of the respective angled portion joins an associated sidewall of another angled portion adjacent to the respective angled portion, forming a ridge.
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