Steel Ring Mandrel for Sizing and Enlarging This Ring Mandrel is made of case hardened steel, is finely polished to a smooth finish Features ring measurements from sizes 1 to 16, in increments of 1/4 size. Use with Rawhide or Plastic Mallets to enlarge the sizes of gold, silver, or copper ring bands. Made in USA. Overall length: 13", Ring measurements: 1 to 16, Weight: 2 lbs