APT-TJ9710 Jewelers HD Ring Mandrel Solid Steel, Silver w/knurled Grip 12" Professional quality Mandrel is 12" long Measures ring sizes from 1 to 15 Accurate, quarter size increments Hardened Solid Steel Textured "knurled non-slip grip" handle 1lb, 10.3/4oz NOTE:This Mandrel is Not Grooved for Stones!