Features HIGH LIGHT TRANSMITTANCE: High light transmittance, high refractive index, brighter and clearer imaging. ALL METAL MATERIALS: The mirror body is made of all metal materials, with fine workmanship and quality assurance. UNOBSCURED: The viewing is more comfortable, the lens will not be corroded or blurred, and the service life is long. STANDARD INTERFACE: Standard interface, interface diameter 23mm, can be used with microscopes of the same aperture. FEATURES AND USES: It has the characteristics of wide angle eyepiece, high eye point and large field of view, and is used for magnified observation of objects. Specification: Item Type: Eyepiece Material: Aluminum Alloy + Optical Glass Purpose: Magnify And Observe Objects Features: Wide Angle Eyepiece, High Eye Point, Large Field Of View Package List: 1 x Eyepiece Note: Please allow 0‑1mm / 0‑0.04in error due to manual measurement. Thanks for your understanding. Package List 1 x Eyepiece