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 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 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 to determine the ring size. Colour:As Shown Material:Metal Package Contents: 1set * ring sizer measuring tool Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.