The RMSA2 thread-to-thread adapter contains an internal M25 x 0.75 thread and an external RMS (0.800"-36) thread. Made of anodized aluminum, it is machined with the two threads connected by a flange and can be placed at the end of a threaded tube. It is typically used to integrate a scan lens into a lens tube.The unpackaged weight of this adapter is 3.63 g.