| 摘要 |
A wrench tool is described comprising an orifice which has a predetermined geometry for controlling the rotation of a hexagonal work piece. The orifice is substantially cylindrical and comprises an array of only eighteen longitudinal grooves positioned therein. The grooves form a symmetrical pattern around an imaginary central axis. The grooves are formed and spaced apart so as to create an array of only eighteen longitudinal protuberances. The protuberances form a symmetrical pattern around the imaginary central axis for engagement with the work piece. In one embodiment, the protuberances are positioned apart relative to each other and to the imaginary central axis by predetermined dimensions.
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