GemOro® Aluminum Ring Mandrel, Sizes 1–16

Accurately measure ring sizes with this GemOro® aluminum ring mandrel. The mandrel features grooves in quarter-size increments to ensure consistency from your bench to customer. This mandrel is calibrated to match the GemOro precision ring sizer and steel mandrel (both available separately). It is made from aircraft quality aluminum that is military-grade hard anodization.