| 摘要 |
A hollowed socket comprises a driving portion and an engaging portion; an outer side of the driving portion having a receiving groove; an elastic sheet being installed in the receiving groove; and a free end of the elastic sheet having a positioning block. An inner space of the driving portion is communicated to the receiving groove. The elastic sheet has a shape like "8" and one end of the elastic sheet is a fixing end which is fixed to the receiving groove. The elastic sheet is fixed to the receiving groove by using a fixing unit. The elastic sheet is tightly engaged to the receiving groove. An inner space of the driving portion is communicated to an inner space of the engaging portion.
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