The Durston Hardened Ring Mandrel - Round 10-25 is a high quality tapered ring mandrel crafted from premium tool steel. It is hardened to 64 RC and is ground and polished to provide consistent, accurate and durable results. Designed with an ergonomic handle for a comfortable grip, this non-marking mandrel provides support and ease of use during ring molding and shaping. With an approximate length of 365 mm, the mandrel can shape rings from 10 mm to 25 mm in diameter and is suitable for a variety of jewelry applications.