lens adapter ring for rms 20mm microscope lens to c mount 1 inch screw mount camera

this is aluminum made adapter lens adapter ring for royal microscopical society (rms) lens on c mount 1inch screw camera.
suitable for rms microscope lens.
– front side: rms (0.8″ -36) female thread
– rear side: c (1.00″-32) male thread
– thickness: 4.5mm
– weight: 3g

after addition, you can also use it on c mount lens adapters, e.g. c-eos, c-nikon, c-nex, etc.