| 摘要 |
A hand tool includes a main body provided with a mounting portion including a plurality of arcuate protruding faces and a plurality of receiving recesses located between the protruding faces. Each of the receiving recesses has a smaller arc-shaped corner. The proportion of the depth of each of the protruding faces and the distance between the corner of each of the receiving recesses and the corner of an adjacent receiving recess is equal to 1:1.6. Thus, each of the protruding faces is closely rested on the flattened face of the nut rigidly and stably so as to prevent slip of the nut.
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