This 6″ x 2 1/2″ Expandable Drum expands when the machine is turned on which holds the sanding belts in place when the machine is running.  The belts can then be easily changed when the drum is stopped.  6 x 2 1/2″ Wide SCOTT-MURRAY or equal Expandable Drum – Fits 1″ to 1/2″ Arbor size

The 6″ x 2 1/2″ x 18 15/16″ Belts Below fit this drum