Astromania M42X075 Female to M42X075 Female Thread Telescope Adapter M42X075 female thread on both sides This is a very high quality anodized aluminum adapter Converts an M42X075 male thread to a M42X075 female thread All metal construction and anodizing aluminium process durable for long time use Makes it possible to attach M42X075 male thread and M42X075 male thread accessories together Such as you can upgrade your R&P focuser by adding Astromania 125 High Precision Double Helical Focuser to the end of the R&P focuser if there is M42X075 male thread on the R&P focuser this adapter will play very important part in connecting Astromania 125 High Precision Double Helical Focuserand R&P focuser