M42X 0.75 Female to M42X 0.75 Female Thread Telescope Adapter. M42X 0.75 female thread on both sides. This is a very high quality anodized aluminum adapter. Converts an M42X 0.75 male thread to a M42X 0.75 female thread. All metal construction and anodizing aluminium process, durable for long time use. Makes it possible to attach M42X 0.75 male thread and M42X 0.75 male thread accessories together. Such as, you can upgrade your R&P focuser by adding " 1.25" High Precision Double Helical Focuser" to the end of the R&P focuser, if there is M42X 0.75 male thread on the R&P focuser.
this adapter will play very important part in connecting " 1.25" High Precision Double Helical Focuser"and R&P focuser.