| 摘要 |
A combined socket is provided, whereby a screw can be driven either by a cross tipped Phillips type driver or by a square Robertson type driver. The wings of the socket have end walls that curve convexly to permit the end wall to be clear of the corner of the square, right down to the bottom of the end wall. The vertical side faces of the socket have portions inclined at different angles. The upper and lower portions are inclined respectively at a greater angle to the vertical and a smaller angle to the vertical as compared to the side faces of a conventional Robertson type socket allowing a Robertson type driver to contact the side faces part way along the faces.
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