| 摘要 |
A wrench tool is described which comprises an orifice that is formed to control the rotation of a hexagonal work piece. The orifice is substantially cylindrical and includes an array of only eighteen principle longitudinal grooves positioned therein that substantially form a symmetrical pattern around an imaginary central axis. The eighteen grooves are formed and spaced apart so as to create an array of only eighteen principle longitudinal protuberances which also substantially form a symmetrical pattern around the imaginary central axis for engagement with the work piece. The protuberances are positioned apart relative to each other by predetermined distances whereas the least distance between any eight adjacent protuberances is less than the least distance between any ten adjacent protuberances.
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