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1. A telescopic wrench comprising: an outer tube having a passage defined axially therein, the outer tube having a first end and a second end on two opposite ends of the outer tube, an outer sleeve having a first hole and a second hole which is in communication with the first hole, the first hole of the outer sleeve being fitted to a first end of the outer tube, the outer sleeve having an abutment surface formed between the first hole and the second hole, the abutment surface being in contact with an end face of the first end of the outer tube, an inner rod having a work end and a rod section connecting to the work end, the rod section having an annular groove with which an elastic ring is engaged, the rod section being slidably engaged with the passage and the second hole, the elastic ring being compressed by contact with an inner periphery of the passage, the work end being exposed beyond the first end of the outer tube.
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