18mm RMS Extenders Extension Ring for Microscope Objectives Parfocal                                              

Product Feature:

One end is Female theread RMS (0.8 inch 1/36TPI)


The other end is Male theread RMS (0.8 inch 1/36TPI)


adapter (made of aluminum, anodized black) to use RMS thread (.8"X 36tpi) objectives,  


Increase an Objective's Parfocal Length by 18mm per Extender.

this price only for 1 pc adapter,others just for demon.


If you need to customize other sizes adapter rings, please contact us!!