Drill tool

A drilling tool comprising: a motor shaft articulated (2) arranged to transmit rotary motion vo when the opposite first and second ends of said drive shaft are not axially aligned; one guide element (14) arranged so that, in use, holds said first end (8) articulated with the drive shaft a predetermined spatial relationship relative to a workpiece (20) to be drilled, being connected to a portabro - cas (10) articulated the first end of the motor shaft, at the first end (8) thereof; characterized by first and second sheath (34, 36) of the drive shaft, said elements being joined sheath together by an articulated joint (30) substan- tially and surrounding said hinge axis.