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Headstock thread adaptor for 1" x 10tpi Lathes.
Optional chuck insert for using Viper3, Viper5 and Nexus3 chucks on a lathe with a 1" x 10tpi thread on the headstock.
The internal thread is 1" x 10tpi - 25mm in length
The external thread is M33 x 3.5 - 22mm in length
Compatible wih the following models (among others):