Abstract: A rotary driving apparatus having a collet housing defining a passageway which is adapted to receive, engage and rotate a bur having one end thereof which terminates in a notched bur key formed of a magnetizable material having a driving shaft having a first end and a second end which is rotatably supported in a collet housng with the first end of the driving shaft operatively coupled to and rotated by a rotary driving motor and with the second end of the driving shaft positioned within the collet housing passageway and being adapted to receive the bur and to engage and rotate the end of the bur which terminates in a notched bur key formed of a magnetizable material and wherein the second end of the driving shaft includes a cylindrically shaped housing defining a capture cavity and side walls which form a slotted opening which communicates with the capture cavity and with the collet housing passageway to receive and pass the notched bur key end of a bur transported within the collet passageway and to position