If you are doing small projects, this is the best way to make jump rings and coils economically. Mister Twister is a slick little device with a rotating handle that attaches to our coiling mandrels. Just thread the wire through the small hole, rotate the crank while holding the wire in place and you will have all the jump rings or coils you need for those small jobs. Set comes in a metal case for easy storage and organization and includes 8 long mandrels in sizes 1, 2, 2.5, 3, 4, 6 and 8mm. All mandrels are 6" long.