Description
The Durston Square Ring Mandrel with sizing from 4mm to 10mm is made from hardened steel, hardened to 64 RC through induction hardening. It is left unmarked, ground, and polished to provide long-lasting durability and precision. This mandrel is designed for accurate shaping and sizing of square-profile rings, offering reliable performance for professional jewelers in workshops or factories. It weighs approximately 100 grams and is built to last many years in demanding work environments.