Used ER type binocular tube for Nikon Optiphot etc. For Optiphot, Optiphot2, Labophot, Labophot2 etc. Eyepiece insertion diameter 23mm (eyepiece not included).International Buyers - Please Note. This item is in the category "Business & Industrial\Healthcare, Lab & Dental\Medical & Lab Equipment, Devices\Microscopes". The seller is "luckysamurai-store" and is located in this country: JP. This item can be shipped to North, South, or Latin America, all countries in Europe, all countries in continental Asia, Australia.