Pepetools new ring mandrels are the most consistent sizing tools available on the jewellery market today! this mandrel will size a ring consistently and precisely. No matter which mandrel you use by Pepetools, they will all give the same results. This mandrel is graduated and marked with us ring size 1-16. It ships in a handy reusable package. The mandrel is precision manufactured from high grade steel. Afterwards it is hardened to 48-52 hrc meaning it will last a lifetime. The numbers are guaranteed not to wear out.