Abstract: A surgical device for cutting or shaving bone or tissue includes an outer housing having a collet secured to an inner peripheral surface thereof including one or more apertures defined therein. A housing includes an elongated tube extending therefrom configured to support a surgical tool at a distal end thereof. A gear assembly is disposed within the housing and is configured to drive the surgical tool, the gear assembly includes a drive gear housing selectively moveable within the housing to switch the gear assembly between an oscillation mode and a rotation mode for driving the surgical tool. A motor is operably coupled to the gear assembly, such that, upon activation thereof, the motor oscillates or rotates the surgical tool depending upon the position of the drive gear housing within the housing.