| 摘要 |
An extension tool (100) comprises a shank body (10), a sleeve set (20), and a positioning device (30). The sleeve set (20) is rotatably mounted around the shank body (10) and includes a a housing (21), a retainer (22), and an O-ring (23). The housing (21) has a bore (213) extending therethrough and inserted by the shank body (10). The retainer (22) is mounted to the shank body. The O-ring (23) is disposed between a distal end (212) of the housing (21) and the retainer (22). The O-ring (23) is flexible so that the housing (21) is biased by the O-ring (23) to press a connecting element (12) of the shank body (10).
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