Rubber expansion sanding drums are driven by a direct connection to an electric motor; either stationary or hand-held. The rubber on the sanding drum is controlled by tightening or loosening a portion of the drum. In screw lock or nut lock designs, a slotted screw or hex nut controls the expansion. In quick lock designs, expansion is controlled without the use of tools by simply twisting the rubber spindle by hand. When a sanding drum must be directly mounted onto a shaft, specialty drums incorporate the use of internal bore threads or include set screws in the design so that the drum may be secured directly onto a threaded or smooth shaft. Direct shaft mounted drums are ideal for grinders, flexible shafts & bench mandrels.