This package contains 1 ring size mandrel, 1 solid metal rod, 1 jewelry hammer, 1 metal ring gauge set. A total of 4 pieces of combination set. Made of aluminum, marked with American size standards, engraved with dimension marks. The ring mandrel is finely crafted, with rounded outside and square inside, with smooth edges and will not hurt your hands. For ring repair, shaping, polishing and polishing, it is a high-quality jewelry making tool.(Note: The size is not marked on solid metal rods). Use a jewelry hammer to repair or adjust the ring, the hammer head will not leave traces on your jewelry or damage your jewelry. Steel, American size 0-15, ring size marked clearly, easy to use, and accurate size.Perfect for amateur jewelry manufacturers and online shoppers to determine the ring size. Colour:As Shown Material:Metal Package Contents: 1set * ring sizer measuring tool