A rotary tool for use with a rotary driving unit (12,12') for inserting a component (14,14',14") through a surface of a workpiece made of a first material showing friction-induced plasticity to attach said component (14, 14', 14") to the workpiece, said component (14,14',14") having an insert portion extending along an insertion axis of said component (14,14',14"), at least an outer surface of said insert portion being made of a second material harder than said first material, said tool comprising: a tool body adapted to be operationally coupled to the rotary driving unit (12,12'); a securing device (28,28') provided on the tool body for selectively engaging the component (14,14',14") to impart rotation thereof upon operation of the rotary driving unit (12,12') in a first direction while applying an axial force of a sufficient magnitude onto the component (14,14',14") to produce insertion of the insert portion along said axis by plasticizing the first material through friction; and a deburring device arranged for deburring said workpiece surface; characterized in that: the tool body has a working end defining a shoulder portion; the securing device (28, 28') is arranged to produce said insertion at least until said shoulder is contacting said workpiece surface while maintaining said axial force during a sufficient setting time without rotation to produce said attachment; the deburring device is located in said shoulder portion and is capable of being displaced from an inoperative position upon rotation of the tool body in said first rotation direction, to an operative position whenever the tool body is caused to rotate in an opposite direction by the rotary driving unit (12,12') following disengagement of the securing device with said component (14, 14',14"), to provide deburring of said workpiece surface in contact with said shoulder portion following said attachment. a tool body adapted to be operationally coupled to the rotary driving unit (12,12'); a securing device (28,28') provided on the tool body for selectively engaging the component (14,14',14") to impart rotation thereof upon operation of the rotary driving unit (12,12') in a first direction while applying an axial force of a sufficient magnitude onto the component (14,14',14") to produce insertion of the insert portion along said axis by plasticizing the first material through friction; and a deburring device arranged for deburring said workpiece surface; the tool body has a working end defining a shoulder portion; the securing device (28, 28') is arranged to produce said insertion at least until said shoulder is contacting said workpiece surface while maintaining said axial force during a sufficient setting time without rotation to produce said attachment; the deburring device is located in said shoulder portion and is capable of being displaced from an inoperative position upon rotation of the tool body in said first rotation direction, to an operative position whenever the tool body is caused to rotate in an opposite direction by the rotary driving unit (12,12') following disengagement of the securing device with said component (14, 14',14"), to provide deburring of said workpiece surface in contact with said shoulder portion following said attachment.