Abstract: A work tool equipped with a dust extraction device, the piercing tool includes a working head secured to a drive spindle, the extraction device has an extraction tube mounted around the drive spindle and a first end of which is mounted on a sleeve, the sleeve being mounted so as to rotate freely on the drive spindle of the piercing tool and being connected to a device generating a negative pressure in the extraction tube, wherein at least a portion of the circumference of the second end of the tube is in contact with the drilling head, the extraction device includes a vent formed between the second end of the tube and the working head.

Abstract: The invention concerns a drill including a generally cylindrical body, tipped with a head and provided, over at least part of its length, generally spiral evaporating grooves. The groove(s) are delimited, over at least part of their length, by a succession of facets, attached to one another, and linked to one another by sharp edges or by radius blends.

Abstract: The invention concerns a drill comprising a generally cylindrical body (2), tipped with a head (3) and provided, over at least part of its length, generally spiral evaporating grooves (5). The groove(s) (5) is/are delimited, over at least part of its/their length, by a succession of facets (7), attached to one another, and linked to one another by sharp edges or by radius blends (8).