Solid Steel Graduated Grooved Marked Ring Mandrel USA Sizes 1-15 Grooved to protect set stones in finer pieces, this graduated measurement stick is marked at regular intervals to denote US ring sizes 1 to 15 Solid Steel Marked Ring Measurement stick measures 12" x 31/64" x 1" Solid steel marked sizing mandrel is a must-have tool for jewelers, retailers, and shoppers alike Graduated Mandrel ships brand new in Manufacturer's packaging with our 100% Customer Service Guarantee Graduated Sizer is made of sturdy solid steel, perfect for resizing a ring- it can be heated and hammered with no damage to a ring or the mandrel