Durston Round Plain Triblet, Hardened Steel, 410mm/16″, 10-28mm Diameter

The Durston Hardened Ring Mandrels (Round 10-28 size) are precision-crafted from the highest quality tool steel, hardened to 64 RC, and ground to a smooth finish to ensure consistent, outstanding results. These unmarked tapered mandrels feature ergonomically designed handles for comfortable grip and support during use. They are developed for professional jewelers seeking durable, reliable mandrels that provide accurate sizing and shaping of rings with minimal risk of marring or damage to the metal.