| 摘要 |
A wrench for square and hexagonal nut fasteners having a peripherally closed socket defined by eight notches of right angles for reception of the driving head, the said notches having a square opening of four notches equally spaced about its periphery and sized for engagement with the square nut or bolt, and a hexagonal opening of six notches of right angles with planar surfaces and engaging surfaces being separately sized for engagement with the hexagonal nuts or bolts at a maximum 5% difference of size to each other.
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