Here is a truly revolutionary idea, simple yet extremely effective, invented and patented by a master jeweller.
We call them the "wrap and tap" pliers because the jeweller can wrap ring stock around the barrel shaped jaw , then tap it slightly on a mandrel and instantly make a complete ring, half or quarter shank.
Two sizes are currently available: 14mm barrel for ladies rings and 19mm barrel for Gents rings and coin mountings. You get a perfect circle every time with stock up to 2mm thick. A must for every bench and moderately priced.