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Headstock thread adaptor for M20 x 2.0mm TPI Lathes.
Optional chuck insert for using Viper3, Viper5 and Nexus3 chucks on a lathe with a M20 x 2.0mm thread on the headstock.
The internal thread is M20 x 2.0mm and the external thread is M33 x 3.5. Both threads are 32mm in length.
Compatible wih the following models (among others):