This jewelry mandrel set contains 6mm wide stainless steel ring sizers and is the perfect addition to any bench jeweler's collection. This jewelry mandrel set includes 6mm wide stainless steel ring sizers, sizes 1-16 in half inches and quarter sizes from sizes 4-12. Also comes with an aluminum ring mandrel etched in quarter sizes from 1-16. Ring mandrel measures 12 1/2" long.