Check the listing for details. Meiji / Nikon Microscope Polarizer Slider, Fixed. Condition: Used. Listed at 90.00 USD. Meiji / Nikon Fixed Polarizer for Cross Polarization and DIC The clear aperture is 27 mm.The diameter of the 2nd aperture is also 27 mm. Size: 73.3 x 34 x 5 mm. The knob adds about 15 mm to the overall length. There's a screw, not shown in the photos, that prevents the slider from being accidentally removed. I don't know what models this fits. The illuminator in the photos is Meiji, and that's what they came with, but they also fit some Nikon models. Check the photos and description carefully to see exactly what you're getting. If you have question please ask them before bidding. I don't accept returns except as noted. ------------------------------------------------------------ The shipping cost shown includes shipping charges, packing materials, and insurance. A delivery confirmation fee may also be added for expensive items. An adult signature may be required. There's a FedEx 1-2 day option if you're in a hurry. I'll be listing a number of lenses, lighting, camera port options, and other accessories for Zeiss, Olympus, Mitutoyo, and other microscopes, as well as electrical test equipment and components over the next months. Click "Save Seller" just below and to the right of this description, for easy access to may newest listings. 0.07 3x1.5x.3 ()