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This part is used to replace the removable lip on the newer model Starizona Nexus 0.75x coma corrector, providing a male M54 x 1 thread for a direct threaded mounting to Newtonians with focusers that have female M54 x 1 threads.
Some telescopes have similar M54 x 0.75 threads and we make this same adapter for those as well, see part NexusM54_75_TFA.