This round wooden mandrel is used for forming and shaping. It graduates in size from 12mm to 24mm.
I use this mandrel to drill into a prefabricated ring when I need a hole to rivet something sassy on top.
Handy little mandrel. I use it when I polish rings.
This was just what I was looking for, an inexpensive way for my son to stamp on rings. He had tried to make several for his girlfriend by using things around the house inside the rings. That didn't work out so well for him. This mandrel keeps the rings shape and saves me money on ring blanks!