| 摘要 |
A ratchet screw driver includes a driving stem having a gear rotatably engaged in the bore of a handle and having a free end end for engaging with a fastener to be driven. A ratchet mechanism is engaged in the handle and engaged with the gear of the driving stem for selectively driving the driving stem. A barrel is rotatably engaged on the driving stem and movable along the driving stem for engaging around the fastener and for preventing the fastener from being tilted and for preventing the fastener from hurting the hand of the user.
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