| 摘要 |
An identification structure formed on an outer surface of the socket comprises two parts for indentifying the sizes of the working hole and the square hole, respectively. The part for identifying the size of the square hole includes at least one identification area consisting of at least one axial identification portion or one radial identification portion or a combination of the at least one axial identification portion and the radial identification portion. Each of the axial and radial identification portions is a rectangular structure. The axial identification portion each represents a ⅛ inch, and the radial identification portion each represents 1 inch.
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