Sanding cylinders, mounted on their reusable drums, can be used on a drill press or on the end of a flexible rotating shaft. They allow effective and clean sanding on small, round or oddly shaped workpieces. We recommend that when working on a project that demands different grit sizes, that you use multiple drums in order to avoid having to change out the cylinders too often. The cylinders fix themselves tightly to the drums so that they do not come off when turning at high speeds, and so take some work to change. This is a quality product, made in Italy.
Maximum speed for the cylinders and drums is 12,000 RPMs. But the optimal speed depends on the material being worked and usually is well under the maximum speed. For most materials, the best speed lies between 500 and 1500 RPMs. It is best to experiment with a scrap when using a new material. Please be careful when ordering, that the sanding drum and sanding cylinders will work together, diameter and cylinder height must be the same to be used together!
You can look here for a comparison of the different grit sizes in terms of international norms.