M42X 0.75 female to SCT male thread (2", 24 TPI) Telescope Adapter. This adapter has a standard SCT male thread (2", 24 TPI) on one side to connect to the female SCT thread. The other side has a standard 42mm (M42 x 0.75 ) female thread. All metal construction and anodizing aluminium process, durable for long time use. This is a very high quality anodized aluminum adapter. Converts an M42X 0.75 male thread to a SCT male thread (2", 24 TPI).