Nikon 20X SMZ Stereo Microscope Eyepieces, pair.  The Nikon product number is MMK20208  and is specifically designed to fit the SMZ445/460 but will fit most any of the Nikon line of stereo microscopes. They can be used quite nicely on microscopes from other manufacturers as long as the eyetube diameter is 30mm. The Field of View is 12mm.  These eyepieces are new having only been unpacked to photograph.  The sale is for a pair. Thanks for Looking!