Aluminum Short Ring Mandrel, great for most sizes of rings from 3.5 to 10.75. This Ring Mandrel is easy to use and does not have a groove which makes it great to use with wire, no flat spots in the ring. The shorter length makes this ring mandrel the one to use when traveling. Made of Aluminum. The anodized color will come off with use, but this does not affect the usability of the tool.