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Hardened Ring Mandrels, or triblets, are made from the highest quality materials to produce consistent, outstanding results. The mandrels, consisting of steel hardened to 64 RC, are ground and polished and have ergonomically designed handles.


Ring Mandrels or Triblets

Durston Tools' Hardened Ring Mandrels are made from the highest quality materials to produce consistent, outstanding results. The mandrels, consisting of steel hardened to 64 RC, are ground and polished, and have ergonomically designed handles. Each ring mandrel is created to fit comfortably into your hand, providing support and security. Durston Tools products are all created to provide a lifetime of service and reliability, and this is certainly the case with our full range of hardened ring mandrels.