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Una fresa-redoblón caracterizada por ser una herramienta de una sola pieza en la que la parte exterior la constituye una espiga que es a su vez broca y guia y a continuación un cuerpo cilindrico con una faldilla a 90º en la que lleva labrados una serie de dientes para el corte del material que es lo que constituye la zona de fresa a partir de este cuerpo y concéntrico a él lleva una espiga cilindrica o cónica para su adaptación al porta-broca de un taladro.