Problems with Loose Sanding Belts? Solve it with these Bands - Expanding Drums. These Expandable Rubber Drums fit abrasive bands and in use, they expand to lock belts into place. It can expand with centrifugal force to help keep sanding belts tight while grinding. Wheels come in below 2″ diameter sizes. These expanding drums can be affixed with a hub that fits a 1/4 or 1/8" keyed shaft. It can then be used on surface finishing machines and linear grinding machines. It fits most die grinders and air tools. You can save big when buying in a pack. Travers also offers this product in a unique set combination of (4) quantities of 1/4" shank expanding drum rubber arbors sizes: 3/4" x 1", 1" x 1", 1-1/2" x 1-1/2", 2" x 1-1/2" and (1) quantity of 1/8" shank expanding drum rubber arbor size: 1/2" x 1/2" and (30) quantities of Sanding drum bands (6 for each size arbor). Browse through a selection of expanding drums that you can use with even run or spiral bands in any standard size you need at Travers.