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Sinclair neck turning tool mandrels are made from high grade stainless steel on Precision turning centers. The shape, finish, and size are the result of years of use and experimentation by many hand loaders. All of Sinclair mandrels fit both NT-3000 and NT-1000 neck turning tools and most of older model neck turning tools.
Compared to Sinclair standard mandrels these are oversized to allow a tolerance that makes turning possible without risk of gripping.
Using an expander mandrel prior to neck turning sizes the case to fit the neck turning mandrels perfectly. This correct fit makes the turning process more precise and much easier. Any of the mandrels can be used to "neck" cases up to the next caliber when used with the NT-EXP (Expander Body).
