2pcs M27 to M25 Microscope Objective Lens Adapter Ring f Leica Nikon Microscope
M27: M27 0.75mm. M27 0.75 is for Zeiss microscope objective lens thread size. If you need to connect Objective lens to Nikon Leica Zeiss microscope each other, due to different thread size, then you will need an adapter ring.

