Feature: 1. Reliable Work: The coated lens has high transmittance and high refractive index, so the image is brighter and clearer. 2. Better Images: Enables 10X magnification, the achromatic lens has great achromatization effect for easy and clear view. 3. Smart Designs: Has 20.2mm international standard RMS threaded interface, so microscope with the same size can use it. 4. Fine Crafting: Using copper material with chrome plated shell, has excellent durability with corrosion and falling. 5. Easy to Install: Comes with a compact size and a light weight, the convenient installation can be quickly completed. Specification: Item Type: Microscope Lens Model: 10/0.25 Material: Copper Function: Microscope Accessory Interface Size: Approx. 20.2mm / 0.8in (international standard RMS size) Magnification: 10X Numerical Aperture: 0.25mm Applicable Cover Glass Thickness: 0.17mm Microscope Applicable Mechanical Tube Length: Approx. 160mm / 6.3in Working Distance: Approx. 0.13mm Common Rail Distance: Approx. 195mm / 7.68in Parfocal Distance: Approx. 45mm / 1.77in. Package List: 1 x Microscope Lens1 x Storage Box