Use this steel ring mandrel for a quick and convenient way to size wax ring models. Six sharp blades running from the tip to the handle act as a reaming tool on wax models and ring tubes. Knurled handle provides excellent grip and control. ♣ Diameter ranges from 1/2" to 13/16" ♣ Made of high quality hardened carbon steel ♣ Fits rings from size 1.5 to 10 ♣ Increase ring size up to size 10 ♣ Length 9".