An Outside Disk brush is just one loop of a cylinder brush. They are uses when very light brushing is required or where a very narrow brush is the only way to get to a certain area. Since these brushes are not a continuous metal center, there are limitations on the RPM of the brush. As with all of our custom made brushes the uses and applications are virtually endless. Seals, visual barriers, hold down wheels are just a few examples. The manufacturing and size limitations are the same as cylinder brushes.