Screwdriver for head screws with double cross groove, characterized by a bar of appropriate material, one of whose ends serves to be introduced into a common handle or exert the role of such. The free end of this bar ends by a quadruple excavation that gives rise to a cross in relief of rectilinear arms, equal and crossed perpendicularly by its middle part, which will coincide with the central axis of the bar. This relief in the form of a cross, serves to fit the instrument in the double slot, in the same way, which must carry the screws for which it is specially built. (Machine-translation by Google Translate, not legally binding)
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