| 摘要 |
A drill tool comprises a drive shaft ( 2 ) that is arranged to allow rotational movement to be transmitted from a drill to a drill bit holder ( 10 ) even when the opposite ends of the drive shaft are not axially aligned. The end of the drive shaft housing the drill bit holder ( 10 ) can be inserted into a guide member ( 14 ) that includes a planar element ( 18, 42 ) that is arranged to ensure that the drill bit is maintained at substantially 90° to the surface of a work piece being drilled even if the drill itself is not so aligned.
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