| 摘要 |
A driver includes a polygonal cross-sectional shape which is both tapered and twisted by a defined degree so that in an end view the largest polygonal cross-sectional shape circumscribes the smallest polygonal cross-sectional shape such that the corners of the smallest polygonal cross-sectional shape lies at the sides of the largest polygonal cross-sectional shape. This twisting and tapering configuration facilitates engagement within a fastener socket and provide planar contact along each side of the polygonal shape as well as along the edges of the tapering portion.
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