The Expanding Ring Mandrel is a precision tool designed to hold rings securely during polishing and sanding. Its mechanism works by tightening a nut, which causes the inner walls to expand outward, gripping the inside of the ring without damaging it.

Once attached to a drill or rotary tool, the mandrel allows the ring to rotate at high speed, making the polishing and finishing process much faster and more consistent compared to manual methods.

This tool is ideal for jewelers and makers who need an efficient, repeatable, and accurate way to polish rings, combining mechanical simplicity with professional-level results.