On the Kaye Wood website, it calls it an Arc-Ease tool
http://www.kayewood.com/item/Rings_T...d_Template/373
It looks like you can also get them on Cheryl Phillip's site as well...
http://phillipsfiberart.danemcoweb.c...ategory/tools/
That does look really cool. I hope I remember it when I go to make one. Sometimes it is so much easier on myself if I get a tool that makes life easier. It is so worth it in the end. The cost is worth it for peace of mind for me at least :)