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Un portabrocas perfeccionado, caracterizado por comprender un cuerpo central que lleva en su parte superior un taladro cónico para acoplamiento de espigas o ejes, y en su parte inferior una zona cilíndrica donde se ajusta el cuerpo inferior, presentando en su diámetro exterior un alojamiento por bolas, con el fin de facilitar el esfuerzo axial y una parte cónica roscada donde engrana la cremallera de las mordazas.