The taper and step drill and countersinks are constructed with the use of the best rectified with modern steels and sharpeners numerical control.
The range of the allargafori PERINO-IUR extends from the traditional smooth (diam. 3 to 51) to those in step, in millimeters (diam. 3-60).
Suitable for enlarging holes thicknesses up to 3 mm, it is recommended that, during use, to comply with the recommended cutting speeds on page 5/16 to this catalog and lubricate with cutting oil or grease during the IUR 'use.