| CPC B25B 13/06 (2013.01) [B25B 23/0035 (2013.01)] | 16 Claims |

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1. A socket for engaging a hand tool, comprising:
an operating portion with an opening;
an output surface for insertion of the hand tool located on top of the operating portion, surrounding the opening, and the output surface being perpendicular to a driving axis of the socket;
a middle portion connected to the operating portion; and
an engaging portion with an outer annular wall;
wherein a resistance structure is provided on, and extending annularly along, the output surface and the resistance structure faces the hand tool.
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