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Una fresa escalonada perfeccionada que se caracteriza esencialmente por que las ranuras donde se alojan las cuchillas se hallan descentradas con relación al radio perpendicular a la superficie de base de las mismas, en tanto que una de las caras laterales de la ranura se halla inclinada hacia adentro formando con la perpendicular a la base un ángulo igual al ángulo radial de la cuchilla.