This convenient ring mandrel is a quick and easy way to determine the size of a ring you have on hand or one you are planning to embellish. To determine the ring size, simply slide the ring over the mandrel and check where the ring rests. This tool is wonderful to have on hand, especially if you are creating your own rings with wire or beads. It is made of plastic and features a handle at the end to make it easy to hold. A metal loop allows you to hang it up when not in use.