Expands to securely hold rings from the inside so you can work on the outside. Gain improved access for working on many different ring styles by holding from the inside. This increases your efficiency, especially when stone setting!  Easily handles hard-to-hold tapered rings and delicate designs that can be crushed by ordinary ring clamps. The holder is machined from solid steel and comes with 7 different mandrels that hold rings sizes 4 through 13 without marring. Select the closest mandrel for each ring and expand it by turning the screw until the ring is properly held. This tool fits into any BenchMate collar or can be used by itself. A valuable timesaving addition to the workbench.