| 摘要 |
A tool is disclosed, for use with a punching press for punching holes in workpieces. A punch body is provided, elongated in an axial direction. A first punch head is formed on an end of the punch body, and has a first radial diameter, perpendicular to the axial direction. A second punch head has a second radial diameter, also perpendicular to the axial direction. The second punch head is substantially spaced from the first punch head. A neck is formed between the first and second punch heads, having a uniformly tapered diameter less than the first and second radial diameters.
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